diff --git a/Emby.Dlna/PlayTo/Device.cs b/Emby.Dlna/PlayTo/Device.cs
index 938ce5fbf0f..9961d15b090 100644
--- a/Emby.Dlna/PlayTo/Device.cs
+++ b/Emby.Dlna/PlayTo/Device.cs
@@ -990,7 +990,7 @@ namespace Emby.Dlna.PlayTo
 
             var deviceProperties = new DeviceInfo()
             {
-                Name = string.Join(" ", friendlyNames),
+                Name = string.Join(' ', friendlyNames),
                 BaseUrl = string.Format(CultureInfo.InvariantCulture, "http://{0}:{1}", url.Host, url.Port)
             };
 
diff --git a/Emby.Naming/AudioBook/AudioBookListResolver.cs b/Emby.Naming/AudioBook/AudioBookListResolver.cs
index e9ea9b7a5d7..ca53228903a 100644
--- a/Emby.Naming/AudioBook/AudioBookListResolver.cs
+++ b/Emby.Naming/AudioBook/AudioBookListResolver.cs
@@ -73,7 +73,7 @@ namespace Emby.Naming.AudioBook
 
             var haveChaptersOrPages = stackFiles.Any(x => x.ChapterNumber != null || x.PartNumber != null);
             var groupedBy = stackFiles.GroupBy(file => new { file.ChapterNumber, file.PartNumber });
-            var nameWithReplacedDots = nameParserResult.Name.Replace(" ", ".");
+            var nameWithReplacedDots = nameParserResult.Name.Replace(' ', '.');
 
             foreach (var group in groupedBy)
             {
diff --git a/Emby.Server.Implementations/Data/SqliteExtensions.cs b/Emby.Server.Implementations/Data/SqliteExtensions.cs
index 1af301ceb0e..a04d630887c 100644
--- a/Emby.Server.Implementations/Data/SqliteExtensions.cs
+++ b/Emby.Server.Implementations/Data/SqliteExtensions.cs
@@ -2,6 +2,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Globalization;
 using SQLitePCL.pretty;
 
@@ -59,7 +60,7 @@ namespace Emby.Server.Implementations.Data
 
             connection.RunInTransaction(conn =>
             {
-                conn.ExecuteAll(string.Join(";", queries));
+                conn.ExecuteAll(string.Join(';', queries));
             });
         }
 
@@ -142,11 +143,10 @@ namespace Emby.Server.Implementations.Data
             return result[index].ReadGuidFromBlob();
         }
 
+        [Conditional("DEBUG")]
         private static void CheckName(string name)
         {
-#if DEBUG
             throw new ArgumentException("Invalid param name: " + name, nameof(name));
-#endif
         }
 
         public static void TryBind(this IStatement statement, string name, double value)
diff --git a/Emby.Server.Implementations/Data/SqliteItemRepository.cs b/Emby.Server.Implementations/Data/SqliteItemRepository.cs
index 6e1f2feae49..dad8bec7b04 100644
--- a/Emby.Server.Implementations/Data/SqliteItemRepository.cs
+++ b/Emby.Server.Implementations/Data/SqliteItemRepository.cs
@@ -687,7 +687,7 @@ namespace Emby.Server.Implementations.Data
 
             if (item.Genres.Length > 0)
             {
-                saveItemStatement.TryBind("@Genres", string.Join("|", item.Genres));
+                saveItemStatement.TryBind("@Genres", string.Join('|', item.Genres));
             }
             else
             {
@@ -749,7 +749,7 @@ namespace Emby.Server.Implementations.Data
 
             if (item.LockedFields.Length > 0)
             {
-                saveItemStatement.TryBind("@LockedFields", string.Join("|", item.LockedFields));
+                saveItemStatement.TryBind("@LockedFields", string.Join('|', item.LockedFields));
             }
             else
             {
@@ -758,7 +758,7 @@ namespace Emby.Server.Implementations.Data
 
             if (item.Studios.Length > 0)
             {
-                saveItemStatement.TryBind("@Studios", string.Join("|", item.Studios));
+                saveItemStatement.TryBind("@Studios", string.Join('|', item.Studios));
             }
             else
             {
@@ -785,7 +785,7 @@ namespace Emby.Server.Implementations.Data
 
             if (item.Tags.Length > 0)
             {
-                saveItemStatement.TryBind("@Tags", string.Join("|", item.Tags));
+                saveItemStatement.TryBind("@Tags", string.Join('|', item.Tags));
             }
             else
             {
@@ -807,7 +807,7 @@ namespace Emby.Server.Implementations.Data
 
             if (item is Trailer trailer && trailer.TrailerTypes.Length > 0)
             {
-                saveItemStatement.TryBind("@TrailerTypes", string.Join("|", trailer.TrailerTypes));
+                saveItemStatement.TryBind("@TrailerTypes", string.Join('|', trailer.TrailerTypes));
             }
             else
             {
@@ -902,7 +902,7 @@ namespace Emby.Server.Implementations.Data
 
             if (item.ProductionLocations.Length > 0)
             {
-                saveItemStatement.TryBind("@ProductionLocations", string.Join("|", item.ProductionLocations));
+                saveItemStatement.TryBind("@ProductionLocations", string.Join('|', item.ProductionLocations));
             }
             else
             {
@@ -911,7 +911,7 @@ namespace Emby.Server.Implementations.Data
 
             if (item.ExtraIds.Length > 0)
             {
-                saveItemStatement.TryBind("@ExtraIds", string.Join("|", item.ExtraIds));
+                saveItemStatement.TryBind("@ExtraIds", string.Join('|', item.ExtraIds));
             }
             else
             {
@@ -931,7 +931,7 @@ namespace Emby.Server.Implementations.Data
             string artists = null;
             if (item is IHasArtist hasArtists && hasArtists.Artists.Count > 0)
             {
-                artists = string.Join("|", hasArtists.Artists);
+                artists = string.Join('|', hasArtists.Artists);
             }
 
             saveItemStatement.TryBind("@Artists", artists);
@@ -940,7 +940,7 @@ namespace Emby.Server.Implementations.Data
             if (item is IHasAlbumArtist hasAlbumArtists
                 && hasAlbumArtists.AlbumArtists.Count > 0)
             {
-                albumArtists = string.Join("|", hasAlbumArtists.AlbumArtists);
+                albumArtists = string.Join('|', hasAlbumArtists.AlbumArtists);
             }
 
             saveItemStatement.TryBind("@AlbumArtists", albumArtists);
@@ -2549,7 +2549,7 @@ namespace Emby.Server.Implementations.Data
 
             if (groups.Count > 0)
             {
-                return " Group by " + string.Join(",", groups);
+                return " Group by " + string.Join(',', groups);
             }
 
             return string.Empty;
@@ -2578,7 +2578,7 @@ namespace Emby.Server.Implementations.Data
             }
 
             var commandText = "select "
-                            + string.Join(",", GetFinalColumnsToSelect(query, new[] { "count(distinct PresentationUniqueKey)" }))
+                            + string.Join(',', GetFinalColumnsToSelect(query, new[] { "count(distinct PresentationUniqueKey)" }))
                             + GetFromText()
                             + GetJoinUserDataText(query);
 
@@ -2630,7 +2630,7 @@ namespace Emby.Server.Implementations.Data
             }
 
             var commandText = "select "
-                            + string.Join(",", GetFinalColumnsToSelect(query, _retriveItemColumns))
+                            + string.Join(',', GetFinalColumnsToSelect(query, _retriveItemColumns))
                             + GetFromText()
                             + GetJoinUserDataText(query);
 
@@ -2880,7 +2880,7 @@ namespace Emby.Server.Implementations.Data
             }
 
             var commandText = "select "
-                            + string.Join(",", GetFinalColumnsToSelect(query, _retriveItemColumns))
+                            + string.Join(',', GetFinalColumnsToSelect(query, _retriveItemColumns))
                             + GetFromText()
                             + GetJoinUserDataText(query);
 
@@ -2923,15 +2923,15 @@ namespace Emby.Server.Implementations.Data
 
                 if (EnableGroupByPresentationUniqueKey(query))
                 {
-                    commandText += " select " + string.Join(",", GetFinalColumnsToSelect(query, new[] { "count (distinct PresentationUniqueKey)" })) + GetFromText();
+                    commandText += " select " + string.Join(',', GetFinalColumnsToSelect(query, new[] { "count (distinct PresentationUniqueKey)" })) + GetFromText();
                 }
                 else if (query.GroupBySeriesPresentationUniqueKey)
                 {
-                    commandText += " select " + string.Join(",", GetFinalColumnsToSelect(query, new[] { "count (distinct SeriesPresentationUniqueKey)" })) + GetFromText();
+                    commandText += " select " + string.Join(',', GetFinalColumnsToSelect(query, new[] { "count (distinct SeriesPresentationUniqueKey)" })) + GetFromText();
                 }
                 else
                 {
-                    commandText += " select " + string.Join(",", GetFinalColumnsToSelect(query, new[] { "count (guid)" })) + GetFromText();
+                    commandText += " select " + string.Join(',', GetFinalColumnsToSelect(query, new[] { "count (guid)" })) + GetFromText();
                 }
 
                 commandText += GetJoinUserDataText(query)
@@ -3039,7 +3039,7 @@ namespace Emby.Server.Implementations.Data
                 return string.Empty;
             }
 
-            return " ORDER BY " + string.Join(",", orderBy.Select(i =>
+            return " ORDER BY " + string.Join(',', orderBy.Select(i =>
             {
                 var columnMap = MapOrderByField(i.Item1, query);
 
@@ -3137,7 +3137,7 @@ namespace Emby.Server.Implementations.Data
             var now = DateTime.UtcNow;
 
             var commandText = "select "
-                            + string.Join(",", GetFinalColumnsToSelect(query, new[] { "guid" }))
+                            + string.Join(',', GetFinalColumnsToSelect(query, new[] { "guid" }))
                             + GetFromText()
                             + GetJoinUserDataText(query);
 
@@ -3203,7 +3203,7 @@ namespace Emby.Server.Implementations.Data
 
             var now = DateTime.UtcNow;
 
-            var commandText = "select " + string.Join(",", GetFinalColumnsToSelect(query, new[] { "guid", "path" })) + GetFromText();
+            var commandText = "select " + string.Join(',', GetFinalColumnsToSelect(query, new[] { "guid", "path" })) + GetFromText();
 
             var whereClauses = GetWhereClauses(query, null);
             if (whereClauses.Count != 0)
@@ -3284,7 +3284,7 @@ namespace Emby.Server.Implementations.Data
             var now = DateTime.UtcNow;
 
             var commandText = "select "
-                            + string.Join(",", GetFinalColumnsToSelect(query, new[] { "guid" }))
+                            + string.Join(',', GetFinalColumnsToSelect(query, new[] { "guid" }))
                             + GetFromText()
                             + GetJoinUserDataText(query);
 
@@ -3327,15 +3327,15 @@ namespace Emby.Server.Implementations.Data
 
                 if (EnableGroupByPresentationUniqueKey(query))
                 {
-                    commandText += " select " + string.Join(",", GetFinalColumnsToSelect(query, new[] { "count (distinct PresentationUniqueKey)" })) + GetFromText();
+                    commandText += " select " + string.Join(',', GetFinalColumnsToSelect(query, new[] { "count (distinct PresentationUniqueKey)" })) + GetFromText();
                 }
                 else if (query.GroupBySeriesPresentationUniqueKey)
                 {
-                    commandText += " select " + string.Join(",", GetFinalColumnsToSelect(query, new[] { "count (distinct SeriesPresentationUniqueKey)" })) + GetFromText();
+                    commandText += " select " + string.Join(',', GetFinalColumnsToSelect(query, new[] { "count (distinct SeriesPresentationUniqueKey)" })) + GetFromText();
                 }
                 else
                 {
-                    commandText += " select " + string.Join(",", GetFinalColumnsToSelect(query, new[] { "count (guid)" })) + GetFromText();
+                    commandText += " select " + string.Join(',', GetFinalColumnsToSelect(query, new[] { "count (guid)" })) + GetFromText();
                 }
 
                 commandText += GetJoinUserDataText(query)
@@ -3596,7 +3596,7 @@ namespace Emby.Server.Implementations.Data
                 }
                 else if (excludeTypes.Length > 1)
                 {
-                    var inClause = string.Join(",", excludeTypes.Select(i => "'" + i + "'"));
+                    var inClause = string.Join(',', excludeTypes.Select(i => "'" + i + "'"));
                     whereClauses.Add($"type not in ({inClause})");
                 }
             }
@@ -3607,7 +3607,7 @@ namespace Emby.Server.Implementations.Data
             }
             else if (includeTypes.Length > 1)
             {
-                var inClause = string.Join(",", includeTypes.Select(i => "'" + i + "'"));
+                var inClause = string.Join(',', includeTypes.Select(i => "'" + i + "'"));
                 whereClauses.Add($"type in ({inClause})");
             }
 
@@ -3618,7 +3618,7 @@ namespace Emby.Server.Implementations.Data
             }
             else if (query.ChannelIds.Count > 1)
             {
-                var inClause = string.Join(",", query.ChannelIds.Select(i => "'" + i.ToString("N", CultureInfo.InvariantCulture) + "'"));
+                var inClause = string.Join(',', query.ChannelIds.Select(i => "'" + i.ToString("N", CultureInfo.InvariantCulture) + "'"));
                 whereClauses.Add($"ChannelId in ({inClause})");
             }
 
@@ -4351,7 +4351,7 @@ namespace Emby.Server.Implementations.Data
             }
             else if (query.Years.Length > 1)
             {
-                var val = string.Join(",", query.Years);
+                var val = string.Join(',', query.Years);
 
                 whereClauses.Add("ProductionYear in (" + val + ")");
             }
@@ -4401,7 +4401,7 @@ namespace Emby.Server.Implementations.Data
             }
             else if (queryMediaTypes.Length > 1)
             {
-                var val = string.Join(",", queryMediaTypes.Select(i => "'" + i + "'"));
+                var val = string.Join(',', queryMediaTypes.Select(i => "'" + i + "'"));
 
                 whereClauses.Add("MediaType in (" + val + ")");
             }
@@ -4498,7 +4498,7 @@ namespace Emby.Server.Implementations.Data
                     var paramName = "@HasAnyProviderId" + index;
 
                     // this is a search for the placeholder
-                    hasProviderIds.Add("ProviderIds like " + paramName + "");
+                    hasProviderIds.Add("ProviderIds like " + paramName);
 
                     // this replaces the placeholder with a value, here: %key=val%
                     if (statement != null)
@@ -4549,7 +4549,7 @@ namespace Emby.Server.Implementations.Data
                 }
                 else if (enableItemsByName && includedItemByNameTypes.Count > 1)
                 {
-                    var itemByNameTypeVal = string.Join(",", includedItemByNameTypes.Select(i => "'" + i + "'"));
+                    var itemByNameTypeVal = string.Join(',', includedItemByNameTypes.Select(i => "'" + i + "'"));
                     whereClauses.Add("(TopParentId=@TopParentId or Type in (" + itemByNameTypeVal + "))");
                 }
                 else
@@ -4564,7 +4564,7 @@ namespace Emby.Server.Implementations.Data
             }
             else if (queryTopParentIds.Length > 1)
             {
-                var val = string.Join(",", queryTopParentIds.Select(i => "'" + i.ToString("N", CultureInfo.InvariantCulture) + "'"));
+                var val = string.Join(',', queryTopParentIds.Select(i => "'" + i.ToString("N", CultureInfo.InvariantCulture) + "'"));
 
                 if (enableItemsByName && includedItemByNameTypes.Count == 1)
                 {
@@ -4576,7 +4576,7 @@ namespace Emby.Server.Implementations.Data
                 }
                 else if (enableItemsByName && includedItemByNameTypes.Count > 1)
                 {
-                    var itemByNameTypeVal = string.Join(",", includedItemByNameTypes.Select(i => "'" + i + "'"));
+                    var itemByNameTypeVal = string.Join(',', includedItemByNameTypes.Select(i => "'" + i + "'"));
                     whereClauses.Add("(Type in (" + itemByNameTypeVal + ") or TopParentId in (" + val + "))");
                 }
                 else
@@ -4597,7 +4597,7 @@ namespace Emby.Server.Implementations.Data
 
             if (query.AncestorIds.Length > 1)
             {
-                var inClause = string.Join(",", query.AncestorIds.Select(i => "'" + i.ToString("N", CultureInfo.InvariantCulture) + "'"));
+                var inClause = string.Join(',', query.AncestorIds.Select(i => "'" + i.ToString("N", CultureInfo.InvariantCulture) + "'"));
                 whereClauses.Add(string.Format(CultureInfo.InvariantCulture, "Guid in (select itemId from AncestorIds where AncestorIdText in ({0}))", inClause));
             }
 
@@ -5148,7 +5148,7 @@ AND Type = @InternalPersonType)");
             }
             else if (queryPersonTypes.Count > 1)
             {
-                var val = string.Join(",", queryPersonTypes.Select(i => "'" + i + "'"));
+                var val = string.Join(',', queryPersonTypes.Select(i => "'" + i + "'"));
 
                 whereClauses.Add("PersonType in (" + val + ")");
             }
@@ -5162,7 +5162,7 @@ AND Type = @InternalPersonType)");
             }
             else if (queryExcludePersonTypes.Count > 1)
             {
-                var val = string.Join(",", queryExcludePersonTypes.Select(i => "'" + i + "'"));
+                var val = string.Join(',', queryExcludePersonTypes.Select(i => "'" + i + "'"));
 
                 whereClauses.Add("PersonType not in (" + val + ")");
             }
@@ -5308,19 +5308,19 @@ AND Type = @InternalPersonType)");
 
             var typeClause = itemValueTypes.Length == 1 ?
                 ("Type=" + itemValueTypes[0].ToString(CultureInfo.InvariantCulture)) :
-                ("Type in (" + string.Join(",", itemValueTypes.Select(i => i.ToString(CultureInfo.InvariantCulture))) + ")");
+                ("Type in (" + string.Join(',', itemValueTypes.Select(i => i.ToString(CultureInfo.InvariantCulture))) + ")");
 
             var commandText = "Select Value From ItemValues where " + typeClause;
 
             if (withItemTypes.Count > 0)
             {
-                var typeString = string.Join(",", withItemTypes.Select(i => "'" + i + "'"));
+                var typeString = string.Join(',', withItemTypes.Select(i => "'" + i + "'"));
                 commandText += " AND ItemId In (select guid from typedbaseitems where type in (" + typeString + "))";
             }
 
             if (excludeItemTypes.Count > 0)
             {
-                var typeString = string.Join(",", excludeItemTypes.Select(i => "'" + i + "'"));
+                var typeString = string.Join(',', excludeItemTypes.Select(i => "'" + i + "'"));
                 commandText += " AND ItemId not In (select guid from typedbaseitems where type in (" + typeString + "))";
             }
 
@@ -5363,7 +5363,7 @@ AND Type = @InternalPersonType)");
 
             var typeClause = itemValueTypes.Length == 1 ?
                 ("Type=" + itemValueTypes[0].ToString(CultureInfo.InvariantCulture)) :
-                ("Type in (" + string.Join(",", itemValueTypes.Select(i => i.ToString(CultureInfo.InvariantCulture))) + ")");
+                ("Type in (" + string.Join(',', itemValueTypes.Select(i => i.ToString(CultureInfo.InvariantCulture))) + ")");
 
             InternalItemsQuery typeSubQuery = null;
 
@@ -5427,7 +5427,7 @@ AND Type = @InternalPersonType)");
             columns = GetFinalColumnsToSelect(query, columns);
 
             var commandText = "select "
-                            + string.Join(",", columns)
+                            + string.Join(',', columns)
                             + GetFromText()
                             + GetJoinUserDataText(query);
 
@@ -5504,7 +5504,7 @@ AND Type = @InternalPersonType)");
             if (query.EnableTotalRecordCount)
             {
                 var countText = "select "
-                            + string.Join(",", GetFinalColumnsToSelect(query, new[] { "count (distinct PresentationUniqueKey)" }))
+                            + string.Join(',', GetFinalColumnsToSelect(query, new[] { "count (distinct PresentationUniqueKey)" }))
                             + GetFromText()
                             + GetJoinUserDataText(query)
                             + whereText;
@@ -5565,7 +5565,7 @@ AND Type = @InternalPersonType)");
                         if (query.EnableTotalRecordCount)
                         {
                             commandText = "select "
-                                        + string.Join(",", GetFinalColumnsToSelect(query, new[] { "count (distinct PresentationUniqueKey)" }))
+                                        + string.Join(',', GetFinalColumnsToSelect(query, new[] { "count (distinct PresentationUniqueKey)" }))
                                         + GetFromText()
                                         + GetJoinUserDataText(query)
                                         + whereText;
diff --git a/Emby.Server.Implementations/Data/SqliteUserDataRepository.cs b/Emby.Server.Implementations/Data/SqliteUserDataRepository.cs
index 2c4e8e0fcc4..6574db60782 100644
--- a/Emby.Server.Implementations/Data/SqliteUserDataRepository.cs
+++ b/Emby.Server.Implementations/Data/SqliteUserDataRepository.cs
@@ -47,7 +47,7 @@ namespace Emby.Server.Implementations.Data
                 connection.RunInTransaction(
                 db =>
                 {
-                    db.ExecuteAll(string.Join(";", new[] {
+                    db.ExecuteAll(string.Join(';', new[] {
 
                         "create table if not exists UserDatas (key nvarchar not null, userId INT not null, rating float null, played bit not null, playCount int not null, isFavorite bit not null, playbackPositionTicks bigint not null, lastPlayedDate datetime null, AudioStreamIndex INT, SubtitleStreamIndex INT)",
 
diff --git a/Emby.Server.Implementations/LiveTv/Listings/SchedulesDirect.cs b/Emby.Server.Implementations/LiveTv/Listings/SchedulesDirect.cs
index 7567ea312c1..d32b70e03f5 100644
--- a/Emby.Server.Implementations/LiveTv/Listings/SchedulesDirect.cs
+++ b/Emby.Server.Implementations/LiveTv/Listings/SchedulesDirect.cs
@@ -35,8 +35,8 @@ namespace Emby.Server.Implementations.LiveTv.Listings
         private readonly ICryptoProvider _cryptoProvider;
 
         private readonly ConcurrentDictionary<string, NameValuePair> _tokens = new ConcurrentDictionary<string, NameValuePair>();
-        private DateTime _lastErrorResponse;
         private readonly JsonSerializerOptions _jsonOptions = JsonDefaults.GetOptions();
+        private DateTime _lastErrorResponse;
 
         public SchedulesDirect(
             ILogger<SchedulesDirect> logger,
diff --git a/Emby.Server.Implementations/LiveTv/TunerHosts/M3uParser.cs b/Emby.Server.Implementations/LiveTv/TunerHosts/M3uParser.cs
index c82b67b41be..c4f173c7ace 100644
--- a/Emby.Server.Implementations/LiveTv/TunerHosts/M3uParser.cs
+++ b/Emby.Server.Implementations/LiveTv/TunerHosts/M3uParser.cs
@@ -155,7 +155,7 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts
 
             if (channelIdValues.Count > 0)
             {
-                channel.Id = string.Join("_", channelIdValues);
+                channel.Id = string.Join('_', channelIdValues);
             }
 
             return channel;
diff --git a/Emby.Server.Implementations/MediaEncoder/EncodingManager.cs b/Emby.Server.Implementations/MediaEncoder/EncodingManager.cs
index f27305cbed7..c6e931448d5 100644
--- a/Emby.Server.Implementations/MediaEncoder/EncodingManager.cs
+++ b/Emby.Server.Implementations/MediaEncoder/EncodingManager.cs
@@ -166,7 +166,7 @@ namespace Emby.Server.Implementations.MediaEncoder
                         }
                         catch (Exception ex)
                         {
-                            _logger.LogError(ex, "Error extracting chapter images for {0}", string.Join(",", video.Path));
+                            _logger.LogError(ex, "Error extracting chapter images for {0}", string.Join(',', video.Path));
                             success = false;
                             break;
                         }
diff --git a/Emby.Server.Implementations/ScheduledTasks/Tasks/ChapterImagesTask.cs b/Emby.Server.Implementations/ScheduledTasks/Tasks/ChapterImagesTask.cs
index 171e4425814..649305fd567 100644
--- a/Emby.Server.Implementations/ScheduledTasks/Tasks/ChapterImagesTask.cs
+++ b/Emby.Server.Implementations/ScheduledTasks/Tasks/ChapterImagesTask.cs
@@ -143,7 +143,7 @@ namespace Emby.Server.Implementations.ScheduledTasks
 
                         Directory.CreateDirectory(parentPath);
 
-                        string text = string.Join("|", previouslyFailedImages);
+                        string text = string.Join('|', previouslyFailedImages);
                         File.WriteAllText(failHistoryPath, text);
                     }
 
diff --git a/Jellyfin.Api/Controllers/UniversalAudioController.cs b/Jellyfin.Api/Controllers/UniversalAudioController.cs
index bacd95baca9..5aa033ccf47 100644
--- a/Jellyfin.Api/Controllers/UniversalAudioController.cs
+++ b/Jellyfin.Api/Controllers/UniversalAudioController.cs
@@ -223,7 +223,7 @@ namespace Jellyfin.Api.Controllers
                     DeInterlace = true,
                     RequireNonAnamorphic = true,
                     EnableMpegtsM2TsMode = true,
-                    TranscodeReasons = mediaSource.TranscodeReasons == null ? null : string.Join(",", mediaSource.TranscodeReasons.Select(i => i.ToString()).ToArray()),
+                    TranscodeReasons = mediaSource.TranscodeReasons == null ? null : string.Join(',', mediaSource.TranscodeReasons.Select(i => i.ToString()).ToArray()),
                     Context = EncodingContext.Static,
                     StreamOptions = new Dictionary<string, string>(),
                     EnableAdaptiveBitrateStreaming = true
@@ -254,7 +254,7 @@ namespace Jellyfin.Api.Controllers
                 CopyTimestamps = true,
                 StartTimeTicks = startTimeTicks,
                 SubtitleMethod = SubtitleDeliveryMethod.Embed,
-                TranscodeReasons = mediaSource.TranscodeReasons == null ? null : string.Join(",", mediaSource.TranscodeReasons.Select(i => i.ToString()).ToArray()),
+                TranscodeReasons = mediaSource.TranscodeReasons == null ? null : string.Join(',', mediaSource.TranscodeReasons.Select(i => i.ToString()).ToArray()),
                 Context = EncodingContext.Static
             };
 
diff --git a/Jellyfin.Api/Helpers/DynamicHlsHelper.cs b/Jellyfin.Api/Helpers/DynamicHlsHelper.cs
index 92ff42b49f4..8a47f7461d9 100644
--- a/Jellyfin.Api/Helpers/DynamicHlsHelper.cs
+++ b/Jellyfin.Api/Helpers/DynamicHlsHelper.cs
@@ -222,7 +222,7 @@ namespace Jellyfin.Api.Helpers
                     {
                         // Force HEVC Main Profile and disable video stream copy.
                         state.OutputVideoCodec = "hevc";
-                        var sdrVideoUrl = ReplaceProfile(playlistUrl, "hevc", string.Join(",", requestedVideoProfiles), "main");
+                        var sdrVideoUrl = ReplaceProfile(playlistUrl, "hevc", string.Join(',', requestedVideoProfiles), "main");
                         sdrVideoUrl += "&AllowVideoStreamCopy=false";
 
                         EncodingHelper encodingHelper = new EncodingHelper(_mediaEncoder, _fileSystem, _subtitleEncoder, _configuration);
diff --git a/MediaBrowser.Controller/Entities/BaseItem.cs b/MediaBrowser.Controller/Entities/BaseItem.cs
index 7598b29e6e5..53d45261e68 100644
--- a/MediaBrowser.Controller/Entities/BaseItem.cs
+++ b/MediaBrowser.Controller/Entities/BaseItem.cs
@@ -1243,7 +1243,7 @@ namespace MediaBrowser.Controller.Entities
                 }
             }
 
-            return string.Join("/", terms.ToArray());
+            return string.Join('/', terms.ToArray());
         }
 
         /// <summary>
@@ -2795,7 +2795,7 @@ namespace MediaBrowser.Controller.Entities
         {
             var list = GetEtagValues(user);
 
-            return string.Join("|", list).GetMD5().ToString("N", CultureInfo.InvariantCulture);
+            return string.Join('|', list).GetMD5().ToString("N", CultureInfo.InvariantCulture);
         }
 
         protected virtual List<string> GetEtagValues(User user)
diff --git a/MediaBrowser.Controller/Entities/TV/Series.cs b/MediaBrowser.Controller/Entities/TV/Series.cs
index 1a379074dc2..a410c1b66f6 100644
--- a/MediaBrowser.Controller/Entities/TV/Series.cs
+++ b/MediaBrowser.Controller/Entities/TV/Series.cs
@@ -107,7 +107,7 @@ namespace MediaBrowser.Controller.Entities.TV
                 return key;
             }
 
-            return key + "-" + string.Join("-", folders);
+            return key + "-" + string.Join('-', folders);
         }
 
         private static string GetUniqueSeriesKey(BaseItem series)
diff --git a/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs b/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs
index 07a9f5ba615..53a78a02730 100644
--- a/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs
+++ b/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs
@@ -592,7 +592,7 @@ namespace MediaBrowser.Controller.MediaEncoding
                 if (state.IsVideoRequest
                     && ((string.Equals(encodingOptions.HardwareAccelerationType, "nvenc", StringComparison.OrdinalIgnoreCase)
                          && (isNvdecDecoder || isCuvidHevcDecoder || isSwDecoder))
-                        || (string.Equals(encodingOptions.HardwareAccelerationType, "amf", StringComparison.OrdinalIgnoreCase) 
+                        || (string.Equals(encodingOptions.HardwareAccelerationType, "amf", StringComparison.OrdinalIgnoreCase)
                             && (isD3d11vaDecoder || isSwDecoder))))
                 {
                     if (isTonemappingSupported)
@@ -1381,7 +1381,8 @@ namespace MediaBrowser.Controller.MediaEncoding
 
                 var requestedProfile = requestedProfiles[0];
                 // strip spaces because they may be stripped out on the query string as well
-                if (!string.IsNullOrEmpty(videoStream.Profile) && !requestedProfiles.Contains(videoStream.Profile.Replace(" ", ""), StringComparer.OrdinalIgnoreCase))
+                if (!string.IsNullOrEmpty(videoStream.Profile)
+                    && !requestedProfiles.Contains(videoStream.Profile.Replace(" ", "", StringComparison.Ordinal), StringComparer.OrdinalIgnoreCase))
                 {
                     var currentScore = GetVideoProfileScore(videoStream.Profile);
                     var requestedScore = GetVideoProfileScore(requestedProfile);
@@ -1710,7 +1711,7 @@ namespace MediaBrowser.Controller.MediaEncoding
 
             if (filters.Count > 0)
             {
-                return " -af \"" + string.Join(",", filters) + "\"";
+                return " -af \"" + string.Join(',', filters) + "\"";
             }
 
             return string.Empty;
@@ -2888,7 +2889,7 @@ namespace MediaBrowser.Controller.MediaEncoding
                 output += string.Format(
                     CultureInfo.InvariantCulture,
                     "{0}",
-                    string.Join(",", filters));
+                    string.Join(',', filters));
             }
 
             return output;
@@ -2914,7 +2915,7 @@ namespace MediaBrowser.Controller.MediaEncoding
             if (threads <= 0)
             {
                 return 0;
-            } 
+            }
             else if (threads >= Environment.ProcessorCount)
             {
                 return Environment.ProcessorCount;
@@ -3864,7 +3865,7 @@ namespace MediaBrowser.Controller.MediaEncoding
                 GetInputArgument(state, encodingOptions),
                 threads,
                 " -vn",
-                string.Join(" ", audioTranscodeParams),
+                string.Join(' ', audioTranscodeParams),
                 outputPath,
                 string.Empty,
                 string.Empty,
diff --git a/MediaBrowser.LocalMetadata/Savers/BaseXmlSaver.cs b/MediaBrowser.LocalMetadata/Savers/BaseXmlSaver.cs
index 396206658d2..a337521c624 100644
--- a/MediaBrowser.LocalMetadata/Savers/BaseXmlSaver.cs
+++ b/MediaBrowser.LocalMetadata/Savers/BaseXmlSaver.cs
@@ -214,7 +214,7 @@ namespace MediaBrowser.LocalMetadata.Savers
 
             if (item.LockedFields.Length > 0)
             {
-                writer.WriteElementString("LockedFields", string.Join("|", item.LockedFields));
+                writer.WriteElementString("LockedFields", string.Join('|', item.LockedFields));
             }
 
             if (item.CriticRating.HasValue)
diff --git a/MediaBrowser.MediaEncoding/Probing/ProbeResultNormalizer.cs b/MediaBrowser.MediaEncoding/Probing/ProbeResultNormalizer.cs
index bd026bce153..b5291b56096 100644
--- a/MediaBrowser.MediaEncoding/Probing/ProbeResultNormalizer.cs
+++ b/MediaBrowser.MediaEncoding/Probing/ProbeResultNormalizer.cs
@@ -1496,7 +1496,7 @@ namespace MediaBrowser.MediaEncoding.Probing
                             video.IndexNumber = int.Parse(numbers[0].Replace(".", string.Empty, StringComparison.Ordinal).Split('/')[0], CultureInfo.InvariantCulture);
                             int totalEpisodesInSeason = int.Parse(numbers[0].Replace(".", string.Empty, StringComparison.Ordinal).Split('/')[1], CultureInfo.InvariantCulture);
 
-                            description = string.Join(" ", numbers, 1, numbers.Length - 1).Trim(); // Skip the first, concatenate the rest, clean up spaces and save it
+                            description = string.Join(' ', numbers, 1, numbers.Length - 1).Trim(); // Skip the first, concatenate the rest, clean up spaces and save it
                         }
                         else
                         {
@@ -1508,7 +1508,7 @@ namespace MediaBrowser.MediaEncoding.Probing
                         if (subtitle.Contains('.', StringComparison.Ordinal))
                         {
                             // skip the comment, keep the subtitle
-                            description = string.Join(".", subtitle.Split('.'), 1, subtitle.Split('.').Length - 1).Trim(); // skip the first
+                            description = string.Join('.', subtitle.Split('.'), 1, subtitle.Split('.').Length - 1).Trim(); // skip the first
                         }
                         else
                         {
diff --git a/MediaBrowser.Model/Dlna/StreamBuilder.cs b/MediaBrowser.Model/Dlna/StreamBuilder.cs
index 431cf0bafa8..a3983afe5fc 100644
--- a/MediaBrowser.Model/Dlna/StreamBuilder.cs
+++ b/MediaBrowser.Model/Dlna/StreamBuilder.cs
@@ -1733,7 +1733,7 @@ namespace MediaBrowser.Model.Dlna
 
                                 if (condition.Condition == ProfileConditionType.Equals || condition.Condition == ProfileConditionType.EqualsAny)
                                 {
-                                    item.SetOption(qualifier, "profile", string.Join(",", values));
+                                    item.SetOption(qualifier, "profile", string.Join(',', values));
                                 }
                             }
 
diff --git a/MediaBrowser.Model/Dlna/StreamInfo.cs b/MediaBrowser.Model/Dlna/StreamInfo.cs
index 55b12ae8108..4765052d595 100644
--- a/MediaBrowser.Model/Dlna/StreamInfo.cs
+++ b/MediaBrowser.Model/Dlna/StreamInfo.cs
@@ -193,12 +193,12 @@ namespace MediaBrowser.Model.Dlna
                     continue;
                 }
 
-                var encodedValue = pair.Value.Replace(" ", "%20");
+                var encodedValue = pair.Value.Replace(" ", "%20", StringComparison.Ordinal);
 
                 list.Add(string.Format(CultureInfo.InvariantCulture, "{0}={1}", pair.Name, encodedValue));
             }
 
-            string queryString = string.Join("&", list.ToArray());
+            string queryString = string.Join('&', list);
 
             return GetUrl(baseUrl, queryString);
         }
@@ -238,11 +238,11 @@ namespace MediaBrowser.Model.Dlna
 
             string audioCodecs = item.AudioCodecs.Length == 0 ?
                 string.Empty :
-                string.Join(",", item.AudioCodecs);
+                string.Join(',', item.AudioCodecs);
 
             string videoCodecs = item.VideoCodecs.Length == 0 ?
                 string.Empty :
-                string.Join(",", item.VideoCodecs);
+                string.Join(',', item.VideoCodecs);
 
             list.Add(new NameValuePair("DeviceProfileId", item.DeviceProfileId ?? string.Empty));
             list.Add(new NameValuePair("DeviceId", item.DeviceId ?? string.Empty));
@@ -322,7 +322,7 @@ namespace MediaBrowser.Model.Dlna
 
             string subtitleCodecs = item.SubtitleCodecs.Length == 0 ?
                string.Empty :
-               string.Join(",", item.SubtitleCodecs);
+               string.Join(',', item.SubtitleCodecs);
 
             list.Add(new NameValuePair("SubtitleCodec", item.SubtitleStreamIndex.HasValue && item.SubtitleDeliveryMethod == SubtitleDeliveryMethod.Embed ? subtitleCodecs : string.Empty));
 
@@ -351,12 +351,12 @@ namespace MediaBrowser.Model.Dlna
                 }
 
                 // strip spaces to avoid having to encode h264 profile names
-                list.Add(new NameValuePair(pair.Key, pair.Value.Replace(" ", "")));
+                list.Add(new NameValuePair(pair.Key, pair.Value.Replace(" ", string.Empty, StringComparison.Ordinal)));
             }
 
             if (!item.IsDirectStream)
             {
-                list.Add(new NameValuePair("TranscodeReasons", string.Join(",", item.TranscodeReasons.Distinct().Select(i => i.ToString()))));
+                list.Add(new NameValuePair("TranscodeReasons", string.Join(',', item.TranscodeReasons.Distinct().Select(i => i.ToString()))));
             }
 
             return list;
diff --git a/MediaBrowser.Model/Entities/MediaStream.cs b/MediaBrowser.Model/Entities/MediaStream.cs
index ca0b93c30f5..d85a8cde955 100644
--- a/MediaBrowser.Model/Entities/MediaStream.cs
+++ b/MediaBrowser.Model/Entities/MediaStream.cs
@@ -211,7 +211,7 @@ namespace MediaBrowser.Model.Entities
                             return result.ToString();
                         }
 
-                        return string.Join(" ", attributes);
+                        return string.Join(' ', attributes);
                     }
 
                     case MediaStreamType.Subtitle:
diff --git a/MediaBrowser.XbmcMetadata/Savers/BaseNfoSaver.cs b/MediaBrowser.XbmcMetadata/Savers/BaseNfoSaver.cs
index 9f22e618efd..0edab378782 100644
--- a/MediaBrowser.XbmcMetadata/Savers/BaseNfoSaver.cs
+++ b/MediaBrowser.XbmcMetadata/Savers/BaseNfoSaver.cs
@@ -465,7 +465,7 @@ namespace MediaBrowser.XbmcMetadata.Savers
 
             if (item.LockedFields.Length > 0)
             {
-                writer.WriteElementString("lockedfields", string.Join("|", item.LockedFields));
+                writer.WriteElementString("lockedfields", string.Join('|', item.LockedFields));
             }
 
             writer.WriteElementString("dateadded", item.DateCreated.ToLocalTime().ToString(DateAddedFormat, CultureInfo.InvariantCulture));