ajax 4.0 0x800a139e - JavaScript runtime error: Sys.ArgumentException: Value must not

[dbrewerton]

I'm in the throws of trying to upgrade my AJAX from 3.5 to 4. A new issue I'm encountering is an error if my control visibility is set to hidden.

ajax 4.0 0x800a139e - JavaScript runtime error: Sys.ArgumentExc eption: Value must not be null for Controls and Behaviors.

Anyone know how to get around this problem? Code base is C#.

[Dormilich]

since JavaScript AJAX does not have any version, this seems to be a C# issue (moving to C# forum).

[dbrewerton]

It's the AJAX Control Toolkit version 4.

[Luk3r]

This may be a silly question, but have you by chance tried hiding the control programmaticall y after the form loads rather than setting the hidden property to True?

[dbrewerton]

No but that sounds like a great idea. What would I need to do to make it happen in C#?

[Luk3r]

In your Form_Load event you can just try:

ControlName.Visisble = False;

Also, what is the name of your control? I was reading that AJAX 3.5 and 4.0 have some trouble dealing with controls that contain strange characters.