asp.net dynamic master page pulls in its aspx session

can I have a an aspx page that chooses masterpage dynamically...then..that masterpage will lay out the page...then the session varaibles inside the aspx page will be inserted into...see code for sample...
<!--BEGIN MASTER PAGE MARKUP-->

<%@ Master Language="VB" AutoEventWireup="false" CodeBehind="Site1.master.vb" Inherits="MasterPagesExample.Site1" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <style type="text/css">
        html
        {
            background-color:white;
            font:14px Georgia,Serif;
        }
        .content
        {
            width:700px;
            margin:auto;
            border-style:2px solid black;
            background-color:white;
            padding:10px;
        }
        .header
        {
            width:700px;
            height:100px;
            border:1px solid grey;
        }
        .breadCrumb
        {
            width:700px;
            height:30px;
            border:1px solid red;
        }
        .menu
        {
            width:700px;
            height:30px;
            border:1px solid blue;
        }
        .centerSection
        {
            width:700px;
            height:302px;
        }
        .leftSide
        {
            width:148px;
            height:300px;
            border:1px solid green;
            float:left;
        }
        .mainContent
        {
            width:548px;
            height:300px;
            border:1px solid orange;
            float:right;
        }
        .upperFooter
        {
            width:700px;
            height:80px;
            border:1px solid brown;
        }
        .footer
        {
            width:700px;
            height:60px;
            border:1px solid grey;
        }
        </style>
    <title>Site Master</title>
</head>
<body>
<form id="form1" runat="server">    
<div class="content">
    <div class="header">
        <asp:contentplaceholder id="Header" runat="server">   
			<div>
 				<td>
				</td>
			</div>
 
        </asp:contentplaceholder>
    </div>
    <div class="menu">
        <asp:contentplaceholder id="Menu" runat="server">

<!-- HTML code HERE --->
        </asp:contentplaceholder>
    </div>
    <div class="breadCrumb"> 
        <asp:contentplaceholder id="Bread_Crumb" runat="server">   

<!-- HTML code HERE --->     
        </asp:contentplaceholder>
    </div>
    <div class="centerSection">
        <div class="leftSide">
            <asp:contentplaceholder id="Left_Side_Nav" runat="server"> 

<!-- HTML code HERE --->
            </asp:contentplaceholder>
        </div>
        <div class="mainContent">
            <asp:contentplaceholder id="Main_Content" runat="server"> 

<frameset cols="50%,50%">
    <frame src="frameA.html">
    <frame src="frameB.html">
</frameset>





            </asp:contentplaceholder>
        </div>
    </div>
    <div class="upperFooter">
        <asp:contentplaceholder id="Upper_Footer" runat="server">        
        </asp:contentplaceholder>
    </div>   
    <div class="footer">    
        <asp:contentplaceholder id="Footer" runat="server">              
        </asp:contentplaceholder>
    </div>        
</div>
</form>
</body>
</html>

<!--END MASTER PAGE MARKUP-->



<!--BEGIN WEBFORM1.ASPX MARKUP-->
<%@ Page Language="vb" AutoEventWireup="false" MasterPageFile="~/Site1.Master" CodeBehind="WebForm1.aspx.vb" Inherits="MasterPagesExample.WebForm1" 
    title="Untitled Page" %>


<script runat="server">

   Protected Overrides Sub OnPreInit(ByVal e As EventArgs)
      
        ' overide the curent masterpage
        Page.MasterPageFile = Session("SelectedTheme")


        MyBase.OnPreInit(e)
    End Sub


</script>


<asp:Content ID="Content1" ContentPlaceHolderID="Header" runat="server">
<p>Header content</p><br />
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="Bread_Crumb" runat="server">
<p>Bread_Crumb content</p>
</asp:Content>
<asp:Content ID="Content3" ContentPlaceHolderID="Menu" runat="server">
<p>Menu content</p>
</asp:Content>
<asp:Content ID="Content4" ContentPlaceHolderID="Left_Side_Nav" runat="server">

<%=Session("SessionThis_page_menu")%>

<p>Left_Side_Nav content</p>
</asp:Content>
<asp:Content ID="Content5" ContentPlaceHolderID="Main_Content" runat="server">

<%=Session("SessionMain_content")%>
%=Session("SessionMain_content1")%>
%=Session("SessionMain_content2")%>

<p>Main content</p>
</asp:Content>
<asp:Content ID="Content6" ContentPlaceHolderID="Upper_Footer" runat="server">
<p>Upper_Footer content</p>
</asp:Content>
<asp:Content ID="Content7" ContentPlaceHolderID="Footer" runat="server">
<p>Footer content</p>
<center>Copyright &copy; 2010 by Dty</center>
</asp:Content>

<!--END WEBFORM1.ASPX MARKUP-->

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LVL 10
GlobaLevelAsked:
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Alfred A.Connect With a Mentor Commented:
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GlobaLevelAuthor Commented:
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aibusinesssolutionsCommented:
If you are looking to use different themes, I suggest you look in to theming asp.net applications, it's a simpler way to do what you are trying to accomplish.

http://msdn.microsoft.com/en-us/library/ykzx33wh.aspx
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