LINQ 2 SQL query does not work with a function call

Question

I am quite sure this question has already been asked several times and I do apolgize for asking it once again, but I made a few research and unfortunately I did not find my

Answer 1

LINQ 2 SQL is converting your query into an expression tree, and then translating that expression tree into SQL. Since your custom function doesn't have an SQL correlated function, it doesn't know how to translate it and throws an exception.