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[Solved] AJAXPanel does postback & Page_Load

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Ajax

This is a migrated thread and some comments may be shown as answers.

Simon asked on 06 Jan 2008, 07:38 AM

I am trialing the prometheus with VS2008.

I have a problem with the RadAjaxPanel - it causes Page_Load and Page.IsPostback is true ... can you help.
Also : is Viewstate for entire page being sent over (eeeek) ?
Thanks.

Default.aspx:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="testAjaxPanel._Default" %>

<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>

        <asp:ScriptManager ID="ScriptManager1" runat="server">
        </asp:ScriptManager>
        <telerik:RadAjaxPanel ID="RadAjaxPanel1" runat="server" Height="200px"
            Width="300px">
            <asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />
            <asp:TextBox ID="TextBox1" runat="server" />
        </telerik:RadAjaxPanel>

</div>
</form>
</body>
</html>

Default.aspx.cs:

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

namespace testAjaxPanel
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (Page.IsPostBack)
            {
                TextBox1.Text += "NOOOO";
            }

}

        protected void Button1_Click(object sender, EventArgs e)
        {
            TextBox1.Text += "Po";
        }
    }
}

3 Answers, 1 is accepted

answered on 08 Jan 2008, 09:00 AM

Hello Simon,

What we benefit from are the smaller chunks of html being sent back and forth and not the ViewState, which is always sent. Note that this is not "our idea" of how things should work - every ajax framework on the net works this way. Usually when there is a lot of data a significant amount of ViewState is sent to the server. You can save the roundtrip and store the ViewState in the ASP.NET session. This reduced the render size significantly and improves performance.
Generally you can look in the help of the RadControls for any specific performance optimizations. This forum thread should be a good start as well.

All the best,
Steve
the Telerik team

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