原文地址:http://www.cnblogs.com/dlwang2002/archive/2006/02/06/326165.html

1：设置整个页面都响应该事件

        public void SetEnterControl(object ctrl)
        {
            System.Web.UI.Control command = (System.Web.UI.Control)ctrl;
            Page mPage = command.Page;
            string mScript;
            mScript = @"<script language=""javascript""> 
                            function document.onkeydown() 
                            { 
                               var e = event.srcElement; 
                               var k = event.keyCode; 
                               if (k == 13 && e.type != ""textarea"") 
                               { 
                                  document.getElementById('" + command.ClientID + @"').click();
                                  event.cancelBubble = true; 
                                  event.returnValue = false; 
                               } 
                            } 
                        </script>";
            if (!mPage.IsClientScriptBlockRegistered("SetEnterControl"))
              mPage.RegisterClientScriptBlock("SetEnterControl", mScript);
        }

2：给每个TextBox都设置一个响应

        public void SetEnterControl(TextBox source,Button btn)
        {
            //根据传递的参数来触发命令
            string script=@"
              <script  language='javascript'>
                function SetEnterControl(btnId)
                {
                   var e=event.srcElement;
                   var k = event.keyCode; 
                   if (k == 13 && e.type != 'textarea') 
                   {
                       document.getElementById(btnId).click();
                       event.cancelBubble = true; 
                       event.returnValue = false; 
                   }
                }
               </script>
               ";
            //注册js
            if (!this.Page.IsClientScriptBlockRegistered("SetEnterControl"))
                this.Page.RegisterClientScriptBlock("SetEnterControl", script);
            //给textbox添加属性，使用js函数
            source.Attributes["onkeydown"]="SetEnterControl('"+btn.ClientID+"')";
        }