open popup window in button click event without using jquery

Question

Hi I want to open popup window in button click event without using j-query in asp.net C#. This is simple task i am familiar with Asp.Net MVC. But i am not familiar in Asp.Net so only i am struggling for this simple task.

 

Please any one tell me how to open popup window by button click event without using jquery in asp.net C#.

My web form

 

SpecilalityMaster.Aspx

 

<%@ Page Title="" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="specialitymaster.aspx.cs" Inherits="popupwindow.admin.specialitymaster" %>

<asp:Content ID="Content1" ContentPlaceHolderID="MainContent" runat="server">

<form id="frmPopupExample" runat="server">

<asp:Button ID="btnOpenPopupWindow"runat="server"Text="Open Popup Window" OnClick="btnOpenPopupWindow_Click"/>

</form>

<div class="popup">

<asp:TextBox ID="_lname" runat="server"></asp:TextBox>

<asp:Button ID="Button1"

runat="server"

Text="save" OnClick="Button1_Click"

/>

</div>

</asp:Content>

public partial class specialitymaster : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

}

protected void btnOpenPopupWindow_Click(object sender, EventArgs e)

{

}

protected void Button1_Click(object sender, EventArgs e)

{

}

}

 

i just tried simply. i designed one button and one popup window.if i click open popup window in button click event i need to open popup window. i donno it is possible or not.i created button click event in CS page but i donno how to call that popup window name in button click event .