Fixing some string comparisons

Author: StanleyGoldman

src/GitHub.Api/IO/NiceIO.cs

@@ -27,6 +27,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Globalization;
 using System.Linq;
 using System.Text;
 
@@ -463,8 +464,8 @@ public int CompareTo(object obj)
 
         public bool HasExtension(params string[] extensions)
         {
-            var extensionWithDotLower = ExtensionWithDot.ToLower();
-            return extensions.Any(e => WithDot(e).ToLower() == extensionWithDotLower);
+            var extensionWithDotLower = ExtensionWithDot.ToLower(CultureInfo.InvariantCulture);
+            return extensions.Any(e => WithDot(e).ToLower(CultureInfo.InvariantCulture) == extensionWithDotLower);
         }
 
         private static string WithDot(string extension)

src/GitHub.Api/Installer/GitInstaller.cs

@@ -99,7 +99,7 @@ public bool IsGitLfsExtracted()
             var calculateMd5 = environment.FileSystem.CalculateMD5(GitLfsExecutablePath);
             logger.Trace("GitLFS MD5: {0}", calculateMd5);
             var md5 = environment.IsWindows ? WindowsGitLfsExecutableMD5 : MacGitLfsExecutableMD5;
-            if (String.Compare(calculateMd5, md5, true) != 0)
+            if (md5.Equals(calculateMd5, StringComparison.InvariantCultureIgnoreCase))
             {
                 logger.Trace("{0} has incorrect MD5", GitExecutablePath);
                 return false;