LinqToSql returns null when using Single - not sequence contains no elements [duplicate]

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Linq help - Sql trace returns result, but datacontext returning null

Question 1579164

I tried changing to .Single instead of .SingleOrDefault and the object I get back is null, not 'sequence contains no elements' error. When I use SQL profiler and capture the SQL that is generated, I run the query and get 1 result. What would cause the object to be null?

Thanks for any help, ~ck

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perhaps your field/properties mapping in your DBML is not correct