Ajax ASP.Net Tutorial


            <%@ Page Language="C#" %>
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

    protected void btnSubmit_Click(object sender, EventArgs e)
    {
        System.Threading.Thread.Sleep(3000); // sleep 3 seconds
    }



    UpdatePanel Cancel


    
    
    
    
        <%= DateTime.Now.ToString("T") %>
                    id="btnSubmit1"
            Text="Submit 1"
            OnClick="btnSubmit_Click"
            Runat="server"/>
    
    
    
    
        <%= DateTime.Now.ToString("T") %>
                    id="btnSubmit2"
            Text="Submit 2"
            OnClick="btnSubmit_Click"
            Runat="server" />
    
    
    
    
    var prm = Sys.WebForms.PageRequestManager.getInstance();
    prm.add_initializeRequest( prm_initializeRequest );
    function prm_initializeRequest(sender, args)
    {
        if (prm.get_isInAsyncPostBack())
        {
            alert('Still Processing First Request');
            args.set_cancel(true);
        }
    }