System.Configuration.ExceptionUtil.ParameterNullOrEmpty C# (CSharp) Метод

        static internal ArgumentException ParameterNullOrEmpty(string parameter) {
            return new ArgumentException(SR.GetString(SR.Parameter_NullOrEmpty, parameter), parameter);
        }

 public void SaveAs(string filename, ConfigurationSaveMode saveMode, bool forceSaveAll)
 {
     if (string.IsNullOrEmpty(filename))
     {
         throw ExceptionUtil.ParameterNullOrEmpty("filename");
     }
     this.SaveAsImpl(filename, saveMode, forceSaveAll);
 }