using System;

using System.Linq;

using System.Data;

using System.Xml;

using System.Collections;

using System.Collections.Generic;

using System.Data.DataSetExtensions;

​

public class Program

{

    public static void Main()

    {

        DataTable dataTable = new DataTable();

        dataTable.Columns.Add("ID");

        dataTable.Columns.Add("Name");

        dataTable.Rows.Add("1", "Mark");

        dataTable.Rows.Add("2", "Spencer");

        dataTable.Rows.Add("3", "Ryan");

        //var firstRow = dataTable.Rows[0];

        //dataTable.Rows.Add(firstRow);

        var firstRow = dataTable.Rows[0];

        dataTable.ImportRow(firstRow);

    }

}