public string IsNull(CRLExpression.MethodCallObj methodInfo, ref int parIndex, AddParameHandler addParame) { var field = methodInfo.MemberQueryName; var args = methodInfo.Args.First(); string parName = string.Format("@isnull{0}", parIndex); parIndex += 1; addParame(parName, args); return(dBAdapter.IsNull(field, parName)); }