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Message: [QUOTE="Guest, post: 2879024"] yes, but it has to be supported by your DataAccessLayer... For example, in ADO.NET, when you have to pass a NULL value to the server, you should set the db-variable to DBNull.Value. But, you know what? Try to build sql as if (PostingGuid == null) { sql = "select * from Page where PageGuid IS NULL limit 0, 1"; } else { sql = "select * from Page where PageGuid = " + PostingGuid.ToString() + " limit 0, 1"; } Maybe the problem is in the "IS NULL" construction... [/QUOTE]