you can use user control within your page. simply call user control from your web page. it will work.
<uc4:leftsidemenu id="LeftSideMenu" runat="server" xmlns:uc4="#unknown">
<asp:contentplaceholder id="ContentPlaceHolder1" runat="server" xmlns:asp="#unknown">
This Web Application is specially designed to Access this application from any where
in this code i have used 2 controls as per your req. left side will remain same and i have content in my home.aspx