<%@ Page Language="C#" AutoEventWireup="true" CodeFile="CallBackEventValidationServer.aspx.cs" Inherits="CallBackEventHandler_CallBackEventValidationServer" %>
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>Untitled Page<title>
<script language="javascript" type="text/javascript">
function ReceiveServerData(rValue)
{
alert(rValue);
}
<script>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="sm" runat="server">asp:ScriptManager>
<div>
Name: <input type="text" id="Name" runat="server" />
Address: <input type="text" id="Address" runat="server" />
<input type="button" id="SUBMIT" value="SUBMIT" onclick="CallServer(1, alert('Callback'))" />
<div>
<form>
<body>
.CS Page
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;
public partial class CallBackEventHandler_CallBackEventValidationServer : System.Web.UI.Page,ICallbackEventHandler
{
protected string returnValue = string.Empty;
protected void Page_Load(object sender, EventArgs e)
{
ClientScriptManager cm = Page.ClientScript;
String cbReference = cm.GetCallbackEventReference(this, "arg", "ReceiveServerData", "");
String callbackScript = "function CallServer(arg, context) {" + cbReference + "; }";
cm.RegisterClientScriptBlock(this.GetType(), "CallServer", callbackScript, true);
}
#region ICallbackEventHandler Members
public string GetCallbackResult()
{
return returnValue;
}
public void RaiseCallbackEvent(string eventArgument)
{
try
{
Page.ClientScript.ValidateEvent("SUBMIT");
// Callback logic goes here.
if (Name.Value == string.Empty)
{
returnValue += "* Please fill the value for Name \n";
}
if (Address.Value == string.Empty)
{
returnValue += "* Please fill the value for Address \n";
}
}
catch
{
// Failed callback validation logic.
}
}
#endregion
protected override void Render(HtmlTextWriter writer)
{
Page.ClientScript.RegisterForEventValidation("SUBMIT");
base.Render(writer);
}
}
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