How many times you get this in your ASP.NET AJAX 1.0 applications?

After several support tickets we manage to isolate this to very simple case - standard UpdatePanel and a Button writing in Session. How weird?

Here is the code:


<%@ Page Language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">

<script runat="server">
    Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs)
        Page.Session("test") = "test"
    End Sub

<html xmlns="">
<head runat="server">
    <form id="form1" runat="server">
        <asp:ScriptManager ID="ScriptManager1" runat="server" />
        <asp:UpdatePanel ID="UpdatePanel1" runat="server">
                <asp:Button ID="Button1" Text="Button1" runat="server" OnClick="Button1_Click" />


To reproduce this every time you can simply change something in the web.config file - single space will do the trick.

Now run the application and you will get famous "Sys.WebForms.PageRequestManagerParserErrorException":



So what now?

Well the resolution is even more weird... just add a Global.asax file to your application and you are ready to go!

Weird, isn't it?

About the Author

Vladimir Enchev

is Director of Engineering, Native Mobile UI & Frameworks


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