DataTable GetTableWithUniqueColumn()
        {
            DataTable table = new DataTable();
            table = GetDataFromDB(); //  dynamically getting data from different tables via joins
            table.Columns.Add("UniqueColumn", typeof(Guid));
            foreach (DataRow row in table.Rows)
            {
                row["UniqueColumn"] = Guid.NewGuid();
            }

            return table;
        }