Enable Theming using Cookies

Introduction

In converting my application to .Net 2.0, I wanted to include theme. But I asked myself how I change the theme in sub pages. I have a master page, but I wanted to be able to save the theme the user selected somewhere also. So I decided to use and create a Base Class file which inherits the System.Web.UI.Page. So the tasks is let the user change a theme on my website and save the choice in a cookie. So next time they come back, the theme they choose will be there.



Base Class:

protected override void OnPreInit(EventArgs e)
{
base.OnPreInit(e);
String ThemeName;
if (Master != null)
{
_masterPageOrg = Page.MasterPageFile.ToString();
}

if (Request.Cookies["MyThemes"] != null)
{
ThemeName = Request.Cookies["MyThemes"].Value;
}
else
{
return;
}
switch (ThemeName)
{
case "Green":
Page.Theme = "Green";
break;
case "Orange":
Page.Theme = "Orange";
break;
case "Purple":
Page.Theme = "Purple";
break;
case "Blue":
Page.Theme = "Blue";
break;
case "Red":
Page.Theme = "Red";
break;
case "Yellow":
Page.Theme = "Yellow";
break;
}
}



Master Page Code:

SelTheme.Value = "Orange";
SelTheme.Expires = DateTime.Now.AddMonths(12);
if (Response.Cookies["MyThemes"] == null)
{
Response.Cookies.Add(SelTheme);
}
else
{
Response.Cookies.Remove("MyThemes");
Response.Cookies.Add(SelTheme);
}

View Source Code