SQL Query says a parameter is not supplied, but is added to the SqlCommand object

Question

I have a stored procedure that has a parameter called UserName and in my code behind I have a SqlCommand object that I add the parameters to with the Add method. But for som

Answer 1

By default, the CommandText property needs to contain a complete SQL command, not just the name of the stored procedure.

You can change this by to set the SqlCommand's CommandType property to StoredProcedure.

Alternatively, you could explicitly pass the parameters, by changing the CommandText to "someStoredProcedure @UserName, @ProductCode"; this is a complete SQL statement and will work with the default CommandType of Text.

EDIT: I just tried it, and the only way to get that error message without setting CommandType to StoredProcedure (which he did not do) is if CommandText is EXEC someStoredProcedure. Passing a null parameter gives a different error.