< script language = " javascript " >

         <!--

        

         function  disableOtherSubmit()

        {             var  obj  =  event.srcElement;

             var  objs  =  document.getElementsByTagName('INPUT');

             for ( var  i = 0 ; i < objs.length; i ++ )

            {

                 if (objs[i].type.toLowerCase()  ==  'submit')

                {

                    objs[i].disabled  =   true ;

                }

            }        }

            

         // -->

         </ script >

public   class  PreventMultiClick : System.Web.UI.Page

    {

         protected  System.Web.UI.WebControls.Button Button1;

         protected  System.Web.UI.WebControls.Button Button2;

         protected  System.Web.UI.WebControls.LinkButton LinkButton1;

         protected  System.Web.UI.WebControls.Button Button3;

    

         private   void  Page_Load( object  sender, System.EventArgs e)

        {

             this .GetPostBackEventReference( this .Button3);         // 保证 __doPostBack(eventTarget, eventArgument) 正确注册

             if ( ! IsPostBack)

            {

                System.Text.StringBuilder sb  =   new  System.Text.StringBuilder();

                sb.Append( " if (typeof(Page_ClientValidate) == 'function') { if (Page_ClientValidate() == false) { return false; }} " );     // 保证验证函数的执行

                sb.Append( " if(window.confirm('are you sure?')==false) return false; " );         // 自定义客户端脚本

                sb.Append( " disableOtherSubmit(); " );         //  disable所有submit按钮

                sb.Append( this .GetPostBackEventReference( this .Button3));     // 用__doPostBack来提交，保证按钮的服务器端click事件执行

                sb.Append( " ; " );

                Button3.Attributes.Add( " onclick " ,sb.ToString());

            }

        }

         #region  Web Form Designer generated code

         override   protected   void  OnInit(EventArgs e)

        {

             //

             //  CODEGEN: This call is required by the ASP.NET Web Form Designer.

             //

            InitializeComponent();

             base .OnInit(e);

        }

        

         ///   <summary>

         ///  Required method for Designer support - do not modify

         ///  the contents of this method with the code editor.

         ///   </summary>

         private   void  InitializeComponent()

        {    

             this .Button3.Click  +=   new  System.EventHandler( this .Button3_Click);

             this .Load  +=   new  System.EventHandler( this .Page_Load);

        }

         #endregion

         private   void  Button3_Click( object  sender, System.EventArgs e)

        {

            System.Threading.Thread.Sleep( 3000 );

            Response.Write( " Hello world! " );

        }

    }