ASP.Net Programing Laungage

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;
using System.Collections.Generic;

public partial class dropdatain_dictonary : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Dictionary<int, string> dicRel = new Dictionary<int, string>();

        dicRel.Add(1, "Father");

        dicRel.Add(2, "Mother");

        dicRel.Add(3, "Brother");

        dicRel.Add(4, "Sister");

        dicRel.Add(5, "Others");

        ddlRelatives.DataSource = dicRel;

        ddlRelatives.DataTextField = "Value";

        ddlRelatives.DataValueField = "Key";

        ddlRelatives.DataBind();
    }
}

.ASPX code

<%@ Page Language="C#" AutoEventWireup="true" Codevirtual="dropdatain 
                      dictonary.aspx.cs" Inherits="dropdatain_dictonary" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
         <asp:DropDownList ID="ddlRelatives" runat="server">

        </asp:DropDownList>
    
    </div>
    </form>
</body>
</html>