<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm5.aspx.cs" Inherits="WebApplication16.WebForm5" %>
<!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="DropDownList1" runat="server" AutoPostBack="True"
onselectedindexchanged="DropDownList1_SelectedIndexChanged">
</asp:DropDownList><br />
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox><br />
<asp:Button ID="btn_add" runat="server" Text="Add" onclick="btn_add_Click" />
</div>
</form>
</body>
</html>
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 WebApplication16
{
public partial class WebForm5 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
ddlbind();
}
private void ddlbind()
{
if (!IsPostBack)
{
DropDownList1.Items.Add("Select");
DropDownList1.Items.Add("banglore");
DropDownList1.Items.Add("Mysore");
DropDownList1.Items.Add("other");
TextBox1.Visible = false;
}
}
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
if (DropDownList1.SelectedValue == "other")
{
TextBox1.Visible = true;
}
else
{
TextBox1.Visible = false;
}
}
protected void btn_add_Click(object sender, EventArgs e)
{
DropDownList1.Items.Add(TextBox1.Text);
TextBox1.Text = "";
}
}
}
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