Updates to SnippetRunner for C# to properly kill subtasks

Author: barrycaceres

csharp/runner/SnippetRunner/InstallLocations.cs

@@ -306,16 +306,16 @@ private static bool IsDirectory(string path)
                 {
                     case PlatformID.Win32NT:
                         defaultSupportPath = Path.Combine(installDir.FullName, "data");
-                    break;
+                        break;
                     case PlatformID.MacOSX:
                         defaultSupportPath = Path.Combine(installDir.FullName, "data");
                         break;
                     case PlatformID.Unix:
                         break;
                     default:
-                       throw new NotSupportedException(
-                            "Unsupported Operating System: "
-                            + Environment.OSVersion.Platform);
+                        throw new NotSupportedException(
+                             "Unsupported Operating System: "
+                             + Environment.OSVersion.Platform);
                 }
 
                 // no explicit path, try the default support path

csharp/runner/SnippetRunner/Program.cs

@@ -544,7 +544,9 @@ static void ExecuteSnippet(string snippet,
 
 
             ProcessStartInfo killStartInfo
-                = new ProcessStartInfo("kill", "" + process.Id);
+                = (Environment.OSVersion.Platform == PlatformID.Win32NT)
+                ? new ProcessStartInfo("taskkill", ["/F", "/PID", "" + process.Id])
+                : new ProcessStartInfo("kill", "" + process.Id);
 
             startInfo.WindowStyle = ProcessWindowStyle.Hidden;
             startInfo.UseShellExecute = false;