;  // 暂停指定的服务
         public string PauseService(string serviceName)
         {
              string strRst = null;
              ManagementObject mo = this.managementClass.CreateInstance();
              mo.Path = new ManagementPath(this.strPath+".Name=\""+serviceName+"\"");
              try
              {
                   //判断是否可以暂停
                   if((bool)mo["acceptPause"]&&(string)mo["State"]=="Running")
                       mo.InvokeMethod("PauseService",null);
              }
              catch(ManagementException e)
              {
                   strRst =e.Message;
              }
              return strRst;
         }
         // 恢复指定的服务
         public string ResumeService(string serviceName)
         {
              string strRst = null;
              ManagementObject mo = this.managementClass.CreateInstance();
              mo.Path = new ManagementPath(this.strPath+".Name=\""+serviceName+"\"");
              try
              {
                   //判断是否可以恢复
          &nb