string sql = @"SELECT * FROM TBPRODUCT WHERE classID IN(" + ids + ") AND PRODUCTNAME LIKE ​​'%'+@ProductName+'%'​​ Order by ID desc";

 OleDbParameter[] sps = new OleDbParameter[1];
            sps[0] = AccessDB.CreateParameter("@ProductName", OleDbType.VarChar, productName, 50, ParameterDirection.Input);