Truly I was looking for a way to use callback method to avoid page post back.
I found a good sample of calling server side methods using
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>
<head runat="server">
<title>Untitled Page</title>
<script type="text/javascript">
function GetID()
{
var valueID = document.getElementById("txtID").value;
DoServerAction(valueID,'');
}
function ReceiveDataFromServer(data)
{
document.getElementById("myNewData").innerHTML =data
}
</script>
</head>
<body>
<form id="form1" runat="server">
<input id="txtID" type="text" />
<input type="button" value="Submit" onclick="GetID()" />
<br />
<div runat="server" id="myNewData"></div>
</form>
</body>
</html>
Partial Class _Default
Inherits System.Web.UI.Page
Implements System.Web.UI.ICallbackEventHandler
Protected ReturnData As String = ""
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Dim CR_REF As String = ClientScript.GetCallbackEventReference(Me, "myValue", "ReceiveDataFromServer", "validateF")
If Not ClientScript.IsClientScriptBlockRegistered("DoServerAction") Then
Dim SERVER_SCRIPT As String = " function DoServerAction(myValue,validateF) { " + CR_REF + "}"
ClientScript.RegisterClientScriptBlock(Me.GetType(), "DoServerAction", SERVER_SCRIPT, True)
End If
End Sub
Public Function GetCallbackResult() As String Implements System.Web.UI.ICallbackEventHandler.GetCallbackResult
Dim template As String = ""
If ReturnData.ToLower = "name" Then
template = "Morteza K"
ElseIf ReturnData.ToLower = "address" Then
template = "Never land"
Else
template = "Please Use Valid KeyWord--> Name , Address"
End If
Return template
End Function
Public Sub RaiseCallbackEvent(ByVal eventArgument As String) Implements System.Web.UI.ICallbackEventHandler.RaiseCallbackEvent
If Not String.IsNullOrEmpty(eventArgument) Then
ReturnData = eventArgument
End If
End Sub
End Class