AJAX Problem. Please Help!

Question

I suddenly got a problem and trying very hard to get rid off it but no success.

The problem is that: one day when i opened my website project in VS2005, i was shocked to see the red lines under most of the Controls in html source file. They were working fine before but this time when i placed the mouse pointer over one of the red-underlined control, a tooltip appears with the following error:

"Element 'TextBox' is not a known Element.This can occur if there is a compilation error in the web site."

I am attaching the screenshot image of this error. plz download it and see what i am trying to say.

After some Headache, i realized that this TextBox is placed inside an UpdatePanel. Then I did the following Series of actions:

1- I created a new website in vs2005, to check if the "Ajax" is working or not.

2- I placed one TextBox on webpage. Fine. No error. No red-underline.

3- I placed one UpdatePanel from the "Ajax Extension Toolbox" but a red line appears under the UpdatePanel Declaration showing the same tooltip:

"Element 'UpdatePanel' is not a known Element.This can occur if there is a compilation error in the web site."

4- Then i drag and dropped that TextBox inside the UpdatePanel Tags, the TextBox became red-underlined.

5- It means there was something wrong with the AJAX. so I uninstalled the Ajax Extension 1.0 and downloaded it again from asp.net web site.

6- After Re-Installing the Ajax Extension, I added the Reference of AjaxControlToolkit. dll from the bin directory of the sample website.

 

but still the compliler is not recognizing the UpdatePanel and the controls inside it.

 

I m Helpless.

 

Please Help.

 

 

 

 

Mansoor Bari