using System;

using System.Data;

using System.Data.DataSetExtensions;

using System.Linq;

using System.Xml;

public class Program

{

    public static void Main()

    {

        // Datatable Creation

            DataTable dt = new DataTable();

            DataColumn dc = new DataColumn("Name");

            dt.Columns.Add(dc);

            dc = new DataColumn("bike name");

            dt.Columns.Add(dc);

            dc = new DataColumn("Rate");

            dt.Columns.Add(dc);

            DataRow dr = dt.NewRow();

            dr[0] ="Ram";dr[1]="A";dr[2]="20";dt.Rows.Add(dr);dr = dt.NewRow();

            dr[0] ="Sri";dr[1]="B";dr[2]="10";dt.Rows.Add(dr);dr = dt.NewRow();

            dr[0] ="dina";dr[1]="C";dr[2]="40";dt.Rows.Add(dr);dr = dt.NewRow();

            dr[0] ="Ram";dr[1]="D";dr[2]="50";dt.Rows.Add(dr);dr = dt.NewRow();

            dr[0] ="Sri";dr[1]="E";dr[2]="60";dt.Rows.Add(dr);dr = dt.NewRow();

            dr[0] ="dina";dr[1]="F";dr[2]="70";dt.Rows.Add(dr);dr = dt.NewRow();

            dr[0] ="Ram";dr[1]="S";dr[2]="80";dt.Rows.Add(dr);dr = dt.NewRow();

            dr[0] ="Sri";dr[1]="Q";dr[2]="65";dt.Rows.Add(dr);dr = dt.NewRow();

            dr[0] ="dina";dr[1]="L";dr[2]="70";dt.Rows.Add(dr);dr = dt.NewRow();

            dr[0] ="Sonu";dr[1]="B";dr[2]="30";dt.Rows.Add(dr);

            string [] uniqueCols = dt.DefaultView.ToTable(true, "Name").AsEnumerable().Select(r => r.Field<string>("Name")).ToArray();

        foreach(string name in uniqueCols)

        {

        Console.WriteLine(name);

        }

    }

}