Using variable in Linq query

I'm trying to do something like this in Linq To Entities:
string criteria = FuncToCalcCriteria();
“Select * from tablename where SomeField “  + criteria;//could be >< <>= etc.etec.
? I'm getting 'Method cannot be translated into a store expression' if I put the method into the Linq, but I can't concatenate expressions like you do in SQL strings, so is there a way round?
Silas2Asked:
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naspinskiCommented:
The Dynamic LINQ library has you covered:

http://weblogs.asp.net/scottgu/archive/2008/01/07/dynamic-linq-part-1-using-the-linq-dynamic-query-library.aspx

Scott Guthrie explains it better than I ever could.
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