Master page code:
<%@ Master Language="C#" AutoEventWireup="true" CodeBehind="Admin.master.cs" Inherits="SSTeleCallerApp.AdminPanel.Admin" %>
<!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">
    
    <meta charset="utf-8"/>
	<title>Taxi Booking Application</title>
	
	<link rel="stylesheet" href="../css/layout1.css" type="text/css" media="screen" />
	<!--[if lt IE 9]>
	<link rel="stylesheet" href="css/ie.css" type="text/css" media="screen" />
	<script src="http://html5shim.googlecode.com/svn/trunk/html5.js"></script>
	<![endif]-->
	 <script src="../js/jquery-1.5.2.min.js" type="text/javascript"></script>
	<script src="../js/hideshow.js" type="text/javascript"></script>
	 <script src="../js/jquery.tablesorter.min.js" type="text/javascript"></script>
	<script type="text/javascript" src="../js/jquery.equalHeight.js"></script>
	<script type="text/javascript">
	  	    $(document).ready(function () {
	  	        $(".tablesorter").tablesorter();
	    }
	);
	    $(document).ready(function () {
	        //When page loads...
	        $(".tab_content").hide(); //Hide all content
	        $("ul.tabs li:first").addClass("active").show(); //Activate first tab
	        $(".tab_content:first").show(); //Show first tab content
	        //On Click Event
	        $("ul.tabs li").click(function () {
	            $("ul.tabs li").removeClass("active"); //Remove any "active" class
	            $(this).addClass("active"); //Add "active" class to selected tab
	            $(".tab_content").hide(); //Hide all tab content
	            var activeTab = $(this).find("a").attr("href"); //Find the href attribute value to identify the active tab + content
	            $(activeTab).fadeIn(); //Fade in the active ID content
	            return false;
	        });
	    });
    </script>
    <script type="text/javascript">
        $(function () {
            $('.column').equalHeight();
        });
</script>
    <asp:ContentPlaceHolder ID="head" runat="server">
    </asp:ContentPlaceHolder>
</head>
<body>
    <form id="form1" runat="server">
    <header id="header">
		<hgroup>
			<h1 class="site_title"><a href="DriverMaster.aspx">Admin</a></h1>
			</hgroup>
	</header> <!-- end of header bar -->
	
	<section id="secondary_bar">
		<div class="user">
			<p>  </p>
			<!-- <a class="logout_user" href="#" title="Logout">Logout</a> -->
		</div>
		<div class="breadcrumbs_container">
			</div>
	</section><!-- end of secondary bar -->
	
	<aside id="sidebar" class="column">
		<hr/>
		
		<ul><b>
			<li><a href="DriverMaster.aspx" style="padding-left:0px">Drive Master</a></li>
			<li><a href="LocationMaster.aspx" style="padding-left:0px">Location Master</a></li>
			<li><a href="#" style="padding-left:0px">Cab Master</a></li>
			<li><a href="#" style="padding-left:0px">Telecaller Master</a></li>
            <li><a href="#" style="padding-left:0px">Cab Type Master</a></li>
            <li><a href="#" style="padding-left:0px">Trip Type Master</a></li>
            <li><a href="#" style="padding-left:0px">Branch Master</a></li>
            <li><a href="#" style="padding-left:0px">Customer Master</a></li>
            <li><a href="#" style="padding-left:0px">Report</a></li>
		</ul></b>
		<footer>
			<hr style="margin-top:294px" />
			<p style=" "><strong>Copyright © 2016 Keni Technologies</strong></p>
			<p>Theme by <a href="http://www.kenitechnologies.com">Keni Technologies</a></p>
		</footer>
	</aside><!-- end of sidebar -->
        <asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server">
        
        </asp:ContentPlaceHolder>
    
    </form>
</body>
</html>
 
Child Page:
<%@ Page Title="" Language="C#" MasterPageFile="~/AdminPanel/Admin.Master" AutoEventWireup="true"
    CodeBehind="BranchMaster.aspx.cs" Inherits="SSTeleCallerApp.AdminPanel.BranchMaster" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">
   
    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
    <script src="http://ajax.aspnetcdn.com/ajax/jquery.ui/1.8.9/jquery-ui.js" type="text/javascript"></script>
    <link href="http://ajax.aspnetcdn.com/ajax/jquery.ui/1.8.9/themes/start/jquery-ui.css" rel="stylesheet" type="text/css" />
    
    <script type="text/javascript">
        $("[id*=btnadd]").live("click", function () {
            debugger;
            $("#modal_dialog").dialog({
                title: "Manage Branch",
                autoopen: false,
                width: 500,
                buttons: {
                    ADD: function () {
                        $("#<%= add%>").click();
                        $(this).dialog('close');
                    },
                    Cancel: function () {
                        $(this).dialog('close');
                    }
                },
                modal: true
            });
            return false;
        });
      
    </script>
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
    <asp:Button ID="btnadd" runat="server" Text="Add Branch" style="float:right"  />
        
    <section id="main" class="column">
       		<article class="module width_4_quarter" style=" height:316px; margin-top:5px">
		<header><h3 class="tabs_involved">Branch Master</h3>
		</header>
   
    
        <div class="tab_container">
            <div id="tab" class="tab_content">
                <asp:GridView ID="grdbranch" runat="server" class="tablesorter" AutoGenerateColumns="False">
                    <Columns>
                        <asp:BoundField DataField="ID" HeaderText="ID" />
                        <asp:BoundField DataField="Branch" HeaderText="Branch" />
                        <asp:TemplateField ShowHeader="False">
                            <ItemTemplate>
                                <asp:Button ID="Button1" runat="server" CausesValidation="false" CommandName="" Text="EDIT"  />
                            </ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField ShowHeader="False">
                            <ItemTemplate>
                                <asp:Button ID="Button2" runat="server" CausesValidation="false" CommandName="" Text="DELETE" />
                            </ItemTemplate>
                        </asp:TemplateField>
                    </Columns>
                </asp:GridView>
            </div>
            <!-- end of #tab1 -->
        </div>
        <!-- ID -->
       
 <div id="modal_dialog" style="display: none">
            <div class="tab_container">
                <div id="tab2" class="tab_content">
                    <table class="tablesorter" cellspacing="0">
                        <tbody>
                            <tr>
                                <td>
                                    <b>ID:
                                        <asp:TextBox ID="TextBox1" runat="server" Style="margin-left: 130px"></asp:TextBox>
                                        <br />
                                        <br />
                                        Branch:
                                        <asp:TextBox ID="TextBox2" runat="server" Style="margin-left: 97px"></asp:TextBox>
                                        <br />
                                        <br />
                                </td>
                            </tr>
                            
                                                                   
                        </tbody>
                   <asp:Button ID="add" runat="server" Text="ADD" style="display:none" OnClick="btninsert_Click"></asp:Button>
                    </table>
                                     
                </div>
                <!-- end of #tab1 -->
            </div>
            <!-- ID -->
        </div>
 </section>
</asp:Content>
 
Backend coding
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;
namespace SSTeleCallerApp.AdminPanel
{
    public partial class BranchMaster : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                BindGridview();
              
            }
        }
        protected void BindGridview()
        {
            SqlConnection con = new SqlConnection();
            con.ConnectionString = @"Data Source=WINCTRL-TNT3FMR;Initial Catalog=TaxiAPP;Integrated Security=True";
            con.Open();
            string sql = "select ID,Branch from Branch";
            SqlDataAdapter ad = new SqlDataAdapter(sql, con);
            DataSet ds = new DataSet();
            ad.Fill(ds);
            grdbranch.DataSource = ds;
            grdbranch.DataBind();
        }
 protected void btninsert_Click(object sender, EventArgs e)
        {
            SqlConnection con = new SqlConnection();
            con.ConnectionString = @"Data Source=WINCTRL-TNT3FMR;Initial Catalog=TaxiAPP;Integrated Security=True";
            SqlCommand command = new SqlCommand("Insert into Branch(ID,Branch)values(@ID,@Branch)SELECT SCOPE_IDENTITY()", con);
            con.Open();
            command.Parameters.AddWithValue("@ID", TextBox1.Text);
            command.Parameters.AddWithValue("@Branch", TextBox2.Text);
            command.ExecuteNonQuery();
            con.Close();
}
}
}