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Getting a long PageRequestManagerParserErrorException error with some HTML in it when using ASP.NET Ajax with something like a Gridview?  Does the error only happen once in a while, usually the first time you do something specific after a long delay?

Know you're not actually using Response.Write and only using MS controls?

Well, maybe is trying to do a postback for you to create a cookie when you are using the session variable.

Solution: A dirty solution was calling Session["IWantASessionCookie"] = true; on a page load, after this the problem went away as ASP.NET didn't need to create the local cookie when doing things in the UpdatePanel as it had already done it.

Anybody have a neater solution to extend ASP.NET Ajax to create the cookie automatically using client side Javascript instead of ASP.NET trying to do it normally?