ASP.net

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebApplication8.WebForm1" %>





   


   

   

                    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 WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
               
                DropDownList1.Items.Add("---select-");
                DropDownList1.Items.Add("Active");
                DropDownList1.Items.Add("Deactive");
            
            }
        }

        protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
        {
            Button1.Text = "";
            if (DropDownList1.Text == "Active")
            {
                Button1.Text = "Deactive";
                Button1.Enabled = false;
            }

            else if (DropDownList1.Text == "Deactive")
            {
                Button1.Text = "Active";
                Button1.Enabled = true;
            }

            else
            {
                Button1.Text = "Button1";
                Button1.Enabled = true;
            }
        }
    }
}