//首先要添加 System.ServiceProcess.dll 引用   ServiceController sc = new ServiceController("MSSQLSERVER");   //判斷服務是否已經關閉   if (sc.Status == ServiceControllerStatus.Stopped)   {    sc.Start();    MessageBox.Show("SQL數據庫服務啟動成功！", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Information);   }   //判斷服務是否已經開啟   if (sc.Status != ServiceControllerStatus.Stopped)   {    sc.Stop();    MessageBox.Show("SQL數據庫服務成功關閉！", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Information);   }