form validation stopped working

My website runs on .net 1.1. I have a bunch of forms where I included the required field validations on several fields. The development server is working fine but the validations stopped working on the production server after Windows security updates were run by our network administrator.
I am pretty sure the windows updates did something because nothing has changed in the application and the development server is perfectly fine. I have checked the IIS and the ASP.NET version hasn't changed. It is still 1.1. What else can I check that has changed?

Please advise. What can I do to fix this?
Who is Participating?
Tom BeckConnect With a Mentor Commented:
I have checked the IIS and the ASP.NET version hasn't changed.
What about the .NET Framework version? Was that updated with Windows Updates?

I'm not an expert on this, but my understanding is that ASP.NET and the .NET Framework are two different things. Web servers run the ASP.NET version. The computer OS runs the .NET Framework version. The first time a page is requested in an application, the .NET Framework compiles the file(s) into a dll and sends the response. Then ASP.NET takes over and new requests are served from dll files. That's my understanding. So if the .NET Framework version has changed I'm thinking the app gets re-complied on first run. Depending on how the app was written, changes to the .NET Framework version can mess things up. For example, different versions of the framework will format auto-generated server control ids differently.

Hopefully my post will stir some conversation from experts who really understand this stuff.
Roopesh ReddyIT AnalystCommented:

Did you tried in different browsers? Make sure JavaScript is enabled in the browsers which you are checking!

Hope it helps u...
Angel02Author Commented:
I checked the Registry after I saw your post and did not find .Net 1.1 in it. I don't know if the Windows Update removed it. I am trying to re-install .NET 1.1 and see what happens.
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Tom BeckCommented:
To check the latest version of .NET Framework look in the Windows folder --> Microsoft.NET --> Framework. The highest version listed should be the active version.
>The highest version listed should be the active version.

All versions are active as and when needed. .NET versions live side by side.
Angel02Author Commented:
For my information, will my application by default use the version is was compiled on or the version that is mentioned in the IIS?
Roopesh ReddyConnect With a Mentor IT AnalystCommented:

It uses the version set in the IIS server! I think with the latest IIS, you have two .NET Framework available to select in the AppPool!

.NET Framework 2.0
.NET Framework 4.0

Hope it helps u...
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