How to DropDown list click and display to label?

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication8._Default" %>





   


   

   

       
                    onselectedindexchanged="DropDownList1_SelectedIndexChanged">
       
   

   

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

namespace WebApplication8
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            DropDownList1.AutoPostBack = true;
            if (!IsPostBack)
            {
                DropDownList1.Items.Add("a");
                DropDownList1.Items.Add("b");
                DropDownList1.Items.Add("c");
            }
        }

        protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
        {
           
            Label1.Text = DropDownList1.SelectedItem.Text;
        }
    }
}

double click dropdownlist and write this coding
Label1.Text = DropDownList1.Text;
one condition , click dropdownlist and go to properties "AutoPostBack"=Change to "True"