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" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs)
Page.Session("test") = "test"
<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?
Vladimir Enchev is Director of Engineering, Native Mobile UI & Frameworks