Problem with LINQ Where Clause

var results =  from formNumber in context.DetailTM 
     join c in context.ClaimPeriodTM on formNumber.ClaimPeriod equals c.Cid
     w开发者_StackOverflowhere formNumber.FormNumber.StartsWith(fNumber) 
            && formNumber.RegistrationNumber != registrationNumber
     select new { RegNo = formNumber.RegistrationNumber, 
            CP = c.ClaimPeriod, FormNo = formNumber.FormNumber }; 

The AND CLAUSE with .StartsWith Doesn't work. If I use == operator the query works fine. I tried adding brackets to the where clause but it didn't help. Any idea what is missing. Thank you in Advance.

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Try something very basic like "&& true == false" and see if that fails. Also reverse the order. If you reverse the order, is it still the second clause that fails?

There's nothing about StartsWith that should cause this behavior. There's something else going on here. Trim and move elements until you isolate the real bug.

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What is the database type for FormNumber? If its char (and not varchar), then you may have to trim one or both sides of the comparison.

where
    formNumber.FormNumber.Trim().StartsWith(fNumber.Trim()) 
    && formNumber.RegistrationNumber != registrationNumber

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Same as jrummells answer, just targetted by the additional comments.

formNumber.RegistrationNumber != registrationNumber

Check the database types here. If they are fixed length (char or nchar), you may need to do some trimming.