Greetings ... Thanks for your reply.

To add to my earlier conversation ... this is the code for converting to ToDataset

public static DataSet ToDataSet<T>(this IList<T> list)
        {
            Type elementType = typeof(T);
            DataSet ds = new DataSet();
            DataTable t = new DataTable();
            ds.Tables.Add(t);

            //add a column to table for each public property on T
            foreach (var propInfo in elementType.GetProperties())
            {
                t.Columns.Add(propInfo.Name, propInfo.PropertyType);
            }

            //go through each property on T and add each value to the table
            foreach (T item in list)
            {
                DataRow row = t.NewRow(); foreach (var propInfo in elementType.GetProperties())
                {
                    row[propInfo.Name] = propInfo.GetValue(item, null);
                }
                t.Rows.Add(row);
            }
            return ds;
        }

So now, do I need to change this definition too. Cos, this takes IList as its parameter.