Stored procedure expects a parameter I am already passing in

Question

I am trying to execute a stored procedure with this declaration:

ALTER PROCEDURE [dbo].[getByName]
    @firstName varchar,
    @lastName varchar
AS
...
         


        

Answer 1

Try this it will work:

SqlParameter[] sqlParams = new SqlParameter[] { 
            new SqlParameter("@UserName",(object)userName ?? DBNull.Value),
            new SqlParameter("@Password",(object)password ?? DBNull.Value)
};

If parameter is NULL than replace it with DBNull Type using ?? Operator