title: RegAsm Unregister Issue
body: <p>Below, the method i' ve created is working for registering.
  But i get:
  "regasm : warning ra0000 : no types were unregistered"
  for unregistering.</p>
  
  <pre><code>    private static void ExecuteRegAsm(string comObjectPath, string typeLibraryName, string regAsmPathToExecute, string regAsmParameter = null)
      {
          var startInfo = new ProcessStartInfo
          {
              CreateNoWindow = false,
              UseShellExecute = false,
              FileName = regAsmPathToExecute,
              WindowStyle = ProcessWindowStyle.Hidden
          };
  
          switch (regAsmParameter)
          {
              case  null:
                  startInfo.Arguments = comObjectPath + " /tlb:" + typeLibraryName + " /Codebase";
                  break;
              case "/u":
              case "-u":
                  startInfo.Arguments = "/u " + comObjectPath;
                  break;
          }
  
          using (var exeProcess = Process.Start(startInfo))
          {
              if (exeProcess != null) exeProcess.WaitForExit();
          }
      }
  </code></pre>
  
  <p>How to solve this issue?</p>