LinqToSql + calling .Count fails in production only

This should be very simple, but its very frustrating.

I have a LinqToSql as below, it works fine in development but when i move the code to production it blows up on .Count

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update, resolved the issue, but dont understand why i had to... Please explain if you can, im confused. The code below works fine in development, in order to get it to work in production i had to NOT use deferred typing, so... instead of:

Dim val = From a In开发者_C百科 _configuration Where a.ItemKey = "Val5" Select 

I had to use:

Dim val As IEnumerable(Of MyAssembly.Configuration) _
   = From a In _configuration Where a.ItemKey = "Val5" Select a

Why in the world would the first way work on my development server but not the production server? They both have 3.5 SP1, etc...

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   Dim val = From a In _configuration Where a.ItemKey = "Val5" Select a
    Dim valExists As Boolean = False
    If val.Count > 0 Then
        valExists = True
    End If

The error i get is: System.MissingMemberException: Public member 'Count' on type 'WhereSelectListIterator(Of Configuration,Configuration)' not found.

This makes absolutely no sense to me. The type of val is IEnumerable so why would i not be able to call .Count on this?

Thanks :-)

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try

  val.AsEnumerable.Count 

?

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Just a hunch, try checking if val is returning null for some reason:

If val IsNot Nothing AndAlso val.Count > 0 Then