How To use multiview in C# in asp.net

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;


public partial class Default2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {


    }
    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
     
    }
    protected void Button3_Click(object sender, EventArgs e)
    {
        MultiView1.ActiveViewIndex = DropDownList1.SelectedIndex;
    }
}