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I had two dropdownlists. One that was hard-coded in the .aspx page and one that was being dynamically populated in the code-behind.  I had a requiredfieldvalidator on both.. 

When I submit it would get past the client side validation.  Server side validation
If(Page.IsValid) was failing.

It would come back to the page saying that I needed to choose a value for my dynamically populated ddl.

For the life of me I couldn’t figure it out.

Finally I noticed at the top in the page directive:

EnableViewState="false"

I set this to true and it worked.

Conclusion: if you’re finding values aren’t making it to the code-behind check your ViewState.

I hope this saves someone else the time I lost debugging it.

Filed under: asp.net   Tags: .NET,
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