I have seen a few posts regarding this issue but not one specific to my problem and I have no ideas as to what I need to do to debug this.
I have some combo boxes on an aspx pages, when I select a value from the first one, it fills the second with value and so on with the third and fourth. This works with no problems until I wrap an asp.net UpdatePanel around the combo boxes and try to "ajaxify" the whole process so the page isn't dancing around. The exact error I get is:
Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server. The status code returned from the server was: 404
Some things to note:
I have tried setting the EnablePartialRendering="false" on teh scriptmanager but as I said, it works when not using ajax, so I don't know how to debug the issue.
My server is Windows 2008 running IIS& with ASP.NET 2.0.
I would really appreciate your help
Thanks in advance.
Ok, I have managed to find a solution ... minutes after posting.
I used HTTPWatch to get the URL the request was being posted to. This showed me the URL was Appending to the existing URL each post and not overwriting. I used some JavaScript at the top of my page to set the forms URL to the window location:
Sys.Application.add_load(function()
{
var form = Sys.WebForms.PageRequestManager.getInstance()._form;
form._initialAction = form.action = window.location.href;
});
This sorted it.
Hope it helps someone else.