OS & Servicepack ermitteln

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private string GetOSandServicepack()
{
      OperatingSystem os = Environment.OSVersion;
      string osText = "";
      if (os.Version.Major == 5)
      {
            switch (os.Version.Minor)
            {
                  case 0: osText = "Windows 2000";
                        break;
                  case 1: osText = "Windows XP";
                        break;
                  case 2: osText = "Windows Server 2003";
                        break;
                  default: osText = os.ToString();
                        break;
            }
      }
      else
      {
            if (os.Version.Major == 6)
                  osText = "Windows Vista";
            else
                  osText = os.ToString();
      }
      string osVersion = os.VersionString;
      string spText = os.ServicePack;
      // parameterweise zurück ..
      
      return string.Format("{0} , {1}", osText, spText );
}