Hi Waghuldey,
Refer the sample.
Master Page
<%@ Master Language="C#" AutoEventWireup="true" CodeFile="MasterPage.master.cs" Inherits="MasterPage" %>
<!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></title>
<link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap.min.css" />
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script type="text/javascript" src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/js/bootstrap.min.js"></script>
<asp:ContentPlaceHolder ID="head" runat="server">
</asp:ContentPlaceHolder>
</head>
<body>
<form id="form1" runat="server">
<div class="panel panel-default" style="width: 500px; padding: 10px; margin: 10px">
<div id="Tabs" role="tabpanel">
<!-- Nav tabs -->
<ul class="nav nav-tabs" role="tablist">
<li class="active"><a href="#personal" aria-controls="personal" role="tab" data-toggle="tab">
Personal</a></li>
<li><a href="#employment" aria-controls="employment" role="tab" data-toggle="tab">Employment</a></li>
</ul>
<!-- Tab panes -->
<div class="tab-content" style="padding-top: 20px">
<div role="tabpanel" class="tab-pane active" id="personal">
<iframe id="iframePersonal" src="Personal.aspx"></iframe>
</div>
<div role="tabpanel" class="tab-pane" id="employment">
<iframe id="IframeEmployment" src="Employment.aspx"></iframe>
</div>
</div>
</div>
</div>
<div>
<asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server">
</asp:ContentPlaceHolder>
</div>
</form>
</body>
</html>
Default Page (Inherits Master Page)
<%@ Page Title="" Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true"
CodeFile="Default.aspx.cs" Inherits="_Default" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="Server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">
<hr />
Child Page Start
</asp:Content>
Personal Page
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Personal.aspx.cs" Inherits="CS" %>
<!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></title>
</head>
<body>
<form id="form1" runat="server">
<div>
Personal Page
</div>
</form>
</body>
</html>
Employment Page
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Employment.aspx.cs" Inherits="Employment" %>
<!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></title>
</head>
<body>
<form id="form1" runat="server">
<div>
Employment Page
</div>
</form>
</body>
</html>
