diff --git a/src/Logic/SubtitleFormats/AQTitle.cs b/src/Logic/SubtitleFormats/AQTitle.cs
index a81be1aa1..092641fae 100644
--- a/src/Logic/SubtitleFormats/AQTitle.cs
+++ b/src/Logic/SubtitleFormats/AQTitle.cs
@@ -30,7 +30,7 @@ namespace Nikse.SubtitleEdit.Logic.SubtitleFormats
 
         public override bool IsMine(List<string> lines, string fileName)
         {
-            Subtitle subtitle = new Subtitle();
+            var subtitle = new Subtitle();
             LoadSubtitle(subtitle, lines, fileName);
             return subtitle.Paragraphs.Count > _errorCount;
         }
@@ -72,7 +72,7 @@ namespace Nikse.SubtitleEdit.Logic.SubtitleFormats
             subtitle.Paragraphs.Clear();
             foreach (string line in lines)
             {
-                if (line.StartsWith("-->> "))
+                if (line.StartsWith("-->> ", StringComparison.Ordinal))
                 {
                     string timePart = line.Substring(4).Trim();
                     if (timePart.Length > 0)
diff --git a/src/Logic/SubtitleFormats/AvidCaption.cs b/src/Logic/SubtitleFormats/AvidCaption.cs
index 5ffbfe76f..d4c31d96c 100644
--- a/src/Logic/SubtitleFormats/AvidCaption.cs
+++ b/src/Logic/SubtitleFormats/AvidCaption.cs
@@ -39,9 +39,10 @@ namespace Nikse.SubtitleEdit.Logic.SubtitleFormats
             sb.AppendLine("@ This file written with the Avid Caption plugin, version 1");
             sb.AppendLine();
             sb.AppendLine("<begin subtitles>");
+            const string writeFormat = "{0} {1}{2}{3}{2}";
             foreach (Paragraph p in subtitle.Paragraphs)
             {
-                sb.AppendLine(string.Format("{0} {1}{2}{3}{2}", p.StartTime.ToHHMMSSFF(), EncodeEndTimeCode(p.EndTime), Environment.NewLine, HtmlUtil.RemoveHtmlTags(p.Text, true)));
+                sb.AppendLine(string.Format(writeFormat, p.StartTime.ToHHMMSSFF(), EncodeEndTimeCode(p.EndTime), Environment.NewLine, HtmlUtil.RemoveHtmlTags(p.Text, true)));
                 //00:50:34:22 00:50:39:13
                 //Ich muss dafür sorgen,
                 //dass die Epsteins weiterleben
diff --git a/src/Logic/SubtitleFormats/CapMakerPlus.cs b/src/Logic/SubtitleFormats/CapMakerPlus.cs
index 96defe023..72359e8cb 100644
--- a/src/Logic/SubtitleFormats/CapMakerPlus.cs
+++ b/src/Logic/SubtitleFormats/CapMakerPlus.cs
@@ -9,7 +9,6 @@ namespace Nikse.SubtitleEdit.Logic.SubtitleFormats
 {
     public class CapMakerPlus : SubtitleFormat
     {
-
         private static readonly Regex regexTimeCodes = new Regex(@"^\d\d:\d\d:\d\d:\d\d$", RegexOptions.Compiled);
 
         public override string Extension
@@ -148,7 +147,7 @@ namespace Nikse.SubtitleEdit.Logic.SubtitleFormats
         {
             if (!string.IsNullOrEmpty(fileName) && File.Exists(fileName))
             {
-                FileInfo fi = new FileInfo(fileName);
+                var fi = new FileInfo(fileName);
                 if (fi.Length >= 640 && fi.Length < 1024000) // not too small or too big
                 {
                     if (fileName.EndsWith(".cap", StringComparison.OrdinalIgnoreCase))
diff --git a/src/Logic/SubtitleFormats/Ebu.cs b/src/Logic/SubtitleFormats/Ebu.cs
index 0f103cfda..a462fc681 100644
--- a/src/Logic/SubtitleFormats/Ebu.cs
+++ b/src/Logic/SubtitleFormats/Ebu.cs
@@ -62,21 +62,21 @@ namespace Nikse.SubtitleEdit.Logic.SubtitleFormats
             {
                 get
                 {
-                    if (DiskFormatCode.StartsWith("STL23"))
+                    if (DiskFormatCode.StartsWith("STL23", StringComparison.Ordinal))
                         return 23.0;
-                    if (DiskFormatCode.StartsWith("STL24"))
+                    if (DiskFormatCode.StartsWith("STL24", StringComparison.Ordinal))
                         return 24.0;
-                    if (DiskFormatCode.StartsWith("STL25"))
+                    if (DiskFormatCode.StartsWith("STL25", StringComparison.Ordinal))
                         return 25.0;
-                    if (DiskFormatCode.StartsWith("STL29"))
+                    if (DiskFormatCode.StartsWith("STL29", StringComparison.Ordinal))
                         return 29.0;
-                    if (DiskFormatCode.StartsWith("STL35"))
+                    if (DiskFormatCode.StartsWith("STL35", StringComparison.Ordinal))
                         return 35.0;
-                    if (DiskFormatCode.StartsWith("STL48"))
+                    if (DiskFormatCode.StartsWith("STL48", StringComparison.Ordinal))
                         return 48.0;
-                    if (DiskFormatCode.StartsWith("STL50"))
+                    if (DiskFormatCode.StartsWith("STL50", StringComparison.Ordinal))
                         return 50.0;
-                    if (DiskFormatCode.StartsWith("STL60"))
+                    if (DiskFormatCode.StartsWith("STL60", StringComparison.Ordinal))
                         return 60.0;
                     return 30.0; // should be DiskFormatcode STL30.01
                 }
@@ -332,7 +332,7 @@ namespace Nikse.SubtitleEdit.Logic.SubtitleFormats
 
                 if (header.DisplayStandardCode == "0")
                     newline = encoding.GetString(new byte[] { 0x8A }); //8Ah=CR/LF
-                //                    newline = encoding.GetString(new byte[] { 0x85, 0x8A, 0x0D, 0x84, 0x80 }); //85h=boxing off, 8Ah=CR/LF, 84h=boxing on, 80h, Italics on
+                // newline = encoding.GetString(new byte[] { 0x85, 0x8A, 0x0D, 0x84, 0x80 }); //85h=boxing off, 8Ah=CR/LF, 84h=boxing on, 80h, Italics on
 
                 TextField = TextField.Replace(Environment.NewLine, newline);
 
@@ -514,11 +514,11 @@ namespace Nikse.SubtitleEdit.Logic.SubtitleFormats
                         else if (header.DisplayStandardCode == "0" && header.MaximumNumberOfDisplayableRows == "02") // open subtitling
                             rows = 15;
 
-                        if (p.Text.StartsWith("{\\an7}") || p.Text.StartsWith("{\\an8}") || p.Text.StartsWith("{\\an9}"))
+                        if (p.Text.StartsWith("{\\an7}", StringComparison.Ordinal) || p.Text.StartsWith("{\\an8}", StringComparison.Ordinal) || p.Text.StartsWith("{\\an9}", StringComparison.Ordinal))
                         {
                             tti.VerticalPosition = 1; // top (vertical)
                         }
-                        else if (p.Text.StartsWith("{\\an4}") || p.Text.StartsWith("{\\an5}") || p.Text.StartsWith("{\\an6}"))
+                        else if (p.Text.StartsWith("{\\an4}", StringComparison.Ordinal) || p.Text.StartsWith("{\\an5}", StringComparison.Ordinal) || p.Text.StartsWith("{\\an6}", StringComparison.Ordinal))
                         {
                             tti.VerticalPosition = (byte)(rows / 2); // middle (vertical)
                         }
@@ -531,11 +531,11 @@ namespace Nikse.SubtitleEdit.Logic.SubtitleFormats
                         }
 
                         tti.JustificationCode = saveOptions.JustificationCode;
-                        if (p.Text.StartsWith("{\\an1}") || p.Text.StartsWith("{\\an4}") || p.Text.StartsWith("{\\an7}"))
+                        if (p.Text.StartsWith("{\\an1}", StringComparison.Ordinal) || p.Text.StartsWith("{\\an4}", StringComparison.Ordinal) || p.Text.StartsWith("{\\an7}", StringComparison.Ordinal))
                         {
                             tti.JustificationCode = 1; // 01h=left-justified text
                         }
-                        else if (p.Text.StartsWith("{\\an3}") || p.Text.StartsWith("{\\an6}") || p.Text.StartsWith("{\\an9}"))
+                        else if (p.Text.StartsWith("{\\an3}", StringComparison.Ordinal) || p.Text.StartsWith("{\\an6}", StringComparison.Ordinal) || p.Text.StartsWith("{\\an9}", StringComparison.Ordinal))
                         {
                             tti.JustificationCode = 3; // 03h=right-justified
                         }
@@ -547,7 +547,7 @@ namespace Nikse.SubtitleEdit.Logic.SubtitleFormats
                         tti.SubtitleNumber = (ushort)subtitleNumber;
                         tti.TextField = p.Text;
                         int startTag = tti.TextField.IndexOf('}');
-                        if (tti.TextField.StartsWith("{\\") && startTag > 0 && startTag < 10)
+                        if (tti.TextField.StartsWith("{\\", StringComparison.Ordinal) && startTag > 0 && startTag < 10)
                         {
                             tti.TextField = tti.TextField.Remove(0, startTag + 1);
                         }
@@ -579,15 +579,15 @@ namespace Nikse.SubtitleEdit.Logic.SubtitleFormats
                     {
                         byte[] buffer = FileUtil.ReadAllBytesShared(fileName);
                         EbuGeneralSubtitleInformation header = ReadHeader(buffer);
-                        if (header.DiskFormatCode.StartsWith("STL23") ||
-                            header.DiskFormatCode.StartsWith("STL24") ||
-                            header.DiskFormatCode.StartsWith("STL25") ||
-                            header.DiskFormatCode.StartsWith("STL29") ||
-                            header.DiskFormatCode.StartsWith("STL30") ||
-                            header.DiskFormatCode.StartsWith("STL35") ||
-                            header.DiskFormatCode.StartsWith("STL48") ||
-                            header.DiskFormatCode.StartsWith("STL50") ||
-                            header.DiskFormatCode.StartsWith("STL60"))
+                        if (header.DiskFormatCode.StartsWith("STL23", StringComparison.Ordinal) ||
+                            header.DiskFormatCode.StartsWith("STL24", StringComparison.Ordinal) ||
+                            header.DiskFormatCode.StartsWith("STL25", StringComparison.Ordinal) ||
+                            header.DiskFormatCode.StartsWith("STL29", StringComparison.Ordinal) ||
+                            header.DiskFormatCode.StartsWith("STL30", StringComparison.Ordinal) ||
+                            header.DiskFormatCode.StartsWith("STL35", StringComparison.Ordinal) ||
+                            header.DiskFormatCode.StartsWith("STL48", StringComparison.Ordinal) ||
+                            header.DiskFormatCode.StartsWith("STL50", StringComparison.Ordinal) ||
+                            header.DiskFormatCode.StartsWith("STL60", StringComparison.Ordinal))
                         {
                             return Utilities.IsInteger(header.CodePageNumber) || fileName.EndsWith("stl", StringComparison.OrdinalIgnoreCase);
                         }
@@ -688,7 +688,7 @@ namespace Nikse.SubtitleEdit.Logic.SubtitleFormats
             if (header.CharacterCodeTableNumber == "00")
             {
                 //note that 0xC1—0xCF combines characters - http://en.wikipedia.org/wiki/ISO/IEC_6937
-                Encoding encoding = Encoding.GetEncoding(20269);
+                var encoding = Encoding.GetEncoding(20269);
                 string next = encoding.GetString(buffer, index + 1, 1);
                 switch (buffer[index])
                 {
@@ -932,22 +932,22 @@ namespace Nikse.SubtitleEdit.Logic.SubtitleFormats
             }
             if (header.CharacterCodeTableNumber == "01") // Latin/Cyrillic alphabet - from ISO 8859/5-1988
             {
-                Encoding encoding = Encoding.GetEncoding("ISO-8859-5");
+                var encoding = Encoding.GetEncoding("ISO-8859-5");
                 return encoding.GetString(buffer, index, 1);
             }
             if (header.CharacterCodeTableNumber == "02") // Latin/Arabic alphabet - from ISO 8859/6-1987
             {
-                Encoding encoding = Encoding.GetEncoding("ISO-8859-6");
+                var encoding = Encoding.GetEncoding("ISO-8859-6");
                 return encoding.GetString(buffer, index, 1);
             }
             if (header.CharacterCodeTableNumber == "03") // Latin/Greek alphabet - from ISO 8859/7-1987
             {
-                Encoding encoding = Encoding.GetEncoding("ISO-8859-7"); // or ISO-8859-1 ?
+                var encoding = Encoding.GetEncoding("ISO-8859-7"); // or ISO-8859-1 ?
                 return encoding.GetString(buffer, index, 1);
             }
             if (header.CharacterCodeTableNumber == "04") // Latin/Hebrew alphabet - from ISO 8859/8-1988
             {
-                Encoding encoding = Encoding.GetEncoding("ISO-8859-8");
+                var encoding = Encoding.GetEncoding("ISO-8859-8");
                 return encoding.GetString(buffer, index, 1);
             }
 
@@ -1016,28 +1016,36 @@ namespace Nikse.SubtitleEdit.Logic.SubtitleFormats
                             switch (b)
                             {
                                 case 0x00:
-                                case 0x10: color = "Black";
+                                case 0x10:
+                                    color = "Black";
                                     break;
                                 case 0x01:
-                                case 0x11: color = "Red";
+                                case 0x11:
+                                    color = "Red";
                                     break;
                                 case 0x02:
-                                case 0x12: color = "Green";
+                                case 0x12:
+                                    color = "Green";
                                     break;
                                 case 0x03:
-                                case 0x13: color = "Yellow";
+                                case 0x13:
+                                    color = "Yellow";
                                     break;
                                 case 0x04:
-                                case 0x14: color = "Blue";
+                                case 0x14:
+                                    color = "Blue";
                                     break;
                                 case 0x05:
-                                case 0x15: color = "Magenta";
+                                case 0x15:
+                                    color = "Magenta";
                                     break;
                                 case 0x06:
-                                case 0x16: color = "Cyan";
+                                case 0x16:
+                                    color = "Cyan";
                                     break;
                                 case 0x07:
-                                case 0x17: color = "White";
+                                case 0x17:
+                                    color = "White";
                                     break;
                             }
                         }
diff --git a/src/Logic/SubtitleFormats/Eeg708.cs b/src/Logic/SubtitleFormats/Eeg708.cs
index e96247659..883182a1a 100644
--- a/src/Logic/SubtitleFormats/Eeg708.cs
+++ b/src/Logic/SubtitleFormats/Eeg708.cs
@@ -24,8 +24,8 @@ namespace Nikse.SubtitleEdit.Logic.SubtitleFormats
 
         public override bool IsMine(List<string> lines, string fileName)
         {
-            Subtitle subtitle = new Subtitle();
-            this.LoadSubtitle(subtitle, lines, fileName);
+            var subtitle = new Subtitle();
+            LoadSubtitle(subtitle, lines, fileName);
             return subtitle.Paragraphs.Count > 0;
         }
 
@@ -35,7 +35,7 @@ namespace Nikse.SubtitleEdit.Logic.SubtitleFormats
                 "<?xml version=\"1.0\" encoding=\"utf-8\" ?>" + Environment.NewLine +
                 "<EEG708Captions/>";
 
-            XmlDocument xml = new XmlDocument();
+            var xml = new XmlDocument();
             xml.LoadXml(xmlStructure);
 
             foreach (Paragraph p in subtitle.Paragraphs)
@@ -63,14 +63,14 @@ namespace Nikse.SubtitleEdit.Logic.SubtitleFormats
         {
             _errorCount = 0;
 
-            StringBuilder sb = new StringBuilder();
+            var sb = new StringBuilder();
             lines.ForEach(line => sb.AppendLine(line));
 
             string allText = sb.ToString();
             if (!allText.Contains("<EEG708Captions") || !allText.Contains("<Caption"))
                 return;
 
-            XmlDocument xml = new XmlDocument();
+            var xml = new XmlDocument();
             xml.XmlResolver = null;
             try
             {
@@ -116,14 +116,13 @@ namespace Nikse.SubtitleEdit.Logic.SubtitleFormats
 
         private static TimeCode DecodeTimeCode(string[] parts)
         {
-            string hour = parts[0];
-            string minutes = parts[1];
-            string seconds = parts[2];
-            string frames = parts[3];
+            var hour = int.Parse(parts[0]);
+            var minutes = int.Parse(parts[1]);
+            var seconds = int.Parse(parts[2]);
+            var frames = int.Parse(parts[3]);
 
-            TimeCode tc = new TimeCode(int.Parse(hour), int.Parse(minutes), int.Parse(seconds), FramesToMillisecondsMax999(int.Parse(frames)));
-            return tc;
+            return new TimeCode(hour, minutes, seconds, FramesToMillisecondsMax999(frames));
         }
 
     }
-}
+}
\ No newline at end of file
diff --git a/src/Logic/SubtitleFormats/F4Text.cs b/src/Logic/SubtitleFormats/F4Text.cs
index abe9344ae..9006a171a 100644
--- a/src/Logic/SubtitleFormats/F4Text.cs
+++ b/src/Logic/SubtitleFormats/F4Text.cs
@@ -43,10 +43,11 @@ namespace Nikse.SubtitleEdit.Logic.SubtitleFormats
         {
             var sb = new StringBuilder();
             //double lastEndTimeMilliseconds = -1;
+            const string writeFormat = "{0}{1}";
             foreach (Paragraph p in subtitle.Paragraphs)
             {
                 // if (p.StartTime.TotalMilliseconds == lastEndTimeMilliseconds)
-                sb.AppendFormat("{0}{1}", HtmlUtil.RemoveHtmlTags(p.Text, true), EncodeTimeCode(p.EndTime));
+                sb.AppendFormat(writeFormat, HtmlUtil.RemoveHtmlTags(p.Text, true), EncodeTimeCode(p.EndTime));
                 //else
                 //    sb.Append(string.Format("{0}{1}{2}", EncodeTimeCode(p.StartTime), HtmlUtil.RemoveHtmlTags(p.Text), EncodeTimeCode(p.EndTime)));
                 //lastEndTimeMilliseconds = p.EndTime.TotalMilliseconds;
diff --git a/src/Logic/SubtitleFormats/FabSubtitler.cs b/src/Logic/SubtitleFormats/FabSubtitler.cs
index 2d919a46b..3a2999a6e 100644
--- a/src/Logic/SubtitleFormats/FabSubtitler.cs
+++ b/src/Logic/SubtitleFormats/FabSubtitler.cs
@@ -8,7 +8,7 @@ namespace Nikse.SubtitleEdit.Logic.SubtitleFormats
 {
     public class FabSubtitler : SubtitleFormat
     {
-        private static Regex regexTimeCodes = new Regex(@"^\d\d:\d\d:\d\d:\d\d  \d\d:\d\d:\d\d:\d\d$", RegexOptions.Compiled);
+        private static readonly Regex regexTimeCodes = new Regex(@"^\d\d:\d\d:\d\d:\d\d  \d\d:\d\d:\d\d:\d\d$", RegexOptions.Compiled);
 
         public override string Extension
         {
@@ -34,14 +34,15 @@ namespace Nikse.SubtitleEdit.Logic.SubtitleFormats
 
         public override string ToText(Subtitle subtitle, string title)
         {
-            StringBuilder sb = new StringBuilder();
+            var sb = new StringBuilder();
             int index = 0;
+            const string writeFormat = "{0}  {1}{2}{3}{2}";
             foreach (Paragraph p in subtitle.Paragraphs)
             {
                 //00:50:34:22  00:50:39:13
                 //Ich muss dafür sorgen,
                 //dass die Epsteins weiterleben
-                sb.AppendLine(string.Format("{0}  {1}{2}{3}{2}", EncodeTimeCode(p.StartTime), EncodeTimeCode(p.EndTime), Environment.NewLine, HtmlUtil.RemoveHtmlTags(p.Text)));
+                sb.AppendLine(string.Format(writeFormat, EncodeTimeCode(p.StartTime), EncodeTimeCode(p.EndTime), Environment.NewLine, HtmlUtil.RemoveHtmlTags(p.Text)));
                 index++;
             }
             return sb.ToString();
@@ -95,13 +96,12 @@ namespace Nikse.SubtitleEdit.Logic.SubtitleFormats
         private static TimeCode DecodeTimeCode(string[] parts)
         {
             //00:00:07:12
-            string hour = parts[0];
-            string minutes = parts[1];
-            string seconds = parts[2];
-            string frames = parts[3];
-            TimeCode tc = new TimeCode(int.Parse(hour), int.Parse(minutes), int.Parse(seconds), FramesToMillisecondsMax999(int.Parse(frames)));
-            return tc;
+            var hour = int.Parse(parts[0]);
+            var minutes = int.Parse(parts[1]);
+            var seconds = int.Parse(parts[2]);
+            var frames = int.Parse(parts[3]);
+            return new TimeCode(hour, minutes, seconds, FramesToMillisecondsMax999(frames));
         }
 
     }
-}
+}
\ No newline at end of file