Change website theme dynamically via buttons

Question

I've been learning a bit of asp.net and I've been having issues with the whole dynamic theme change, I've been following a book that teaches how to do it via a drop down menu, but I wanted to challenge myself and do it with buttons.

My website has 2 themes and therefore, two buttons that represent each theme (orangefresh and greenfresh), this is my master page code behind:

    using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class mpage : System.Web.UI.MasterPage
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            string selectedTheme = Page.Theme;
            HttpCookie webtheme = Request.Cookies.Get("webtheme");
            if (webtheme != null)
            {
                selectedTheme = webtheme.Value;
            }

        }
    }
    protected void orangefresh_Click(object sender, EventArgs e)
    {
        HttpCookie webtheme = new HttpCookie("webtheme");
        webtheme.Expires = DateTime.Now.AddMonths(3);
        webtheme.Value = "orangefresh";
        Response.Cookies.Add(webtheme);
        Response.Redirect(Request.Url.ToString());
    }

    protected void greenfresh_Click(object sender, EventArgs e)
    {
        HttpCookie webtheme = new HttpCookie("webtheme");
        webtheme.Expires = DateTime.Now.AddMonths(3);
        webtheme.Value = "greenfresh";
        Response.Cookies.Add(webtheme);
        Response.Redirect(Request.Url.ToString());
    }
}

And this is my Base Page:

using System;
using System.Web;
public class BasePage : System.Web.UI.Page
{
private void Page_PreInit(object sender, EventArgs e)
{
HttpCookie webtheme = Request.Cookies.Get("webtheme");
if (webtheme != null)
{
    Page.Theme = webtheme.Value;
}
}
public BasePage()
{
    this.PreInit += new EventHandler(Page_PreInit);
}
}

Seeing as I have no experience with cookies, I decided to look at the code from the beginning, I tested out if the Click event was storing a value on the cookie, I created a Label on the website and gave it's .Text property the cookie's .Value, nothing happened. So I started to remove code to see what was stopping the event, and I found that this line...

 Response.Redirect(Request.Url.ToString());

... was responsible for it. Just for the sake of it, I removed that one line and tested my website again, still, no changes in the theme.

Any help would be appreciated.

Answer 1

Fixed. I forgot to make the change so that the page I was testing in inherited BasePage... it was inheriting the default page.

Answer 2

Check the below link

http://www.codeproject.com/Articles/18300/How-to-change-page-theme-in-asp-net-2-0-dynamicall

Answer 3

Everything Works fine ..
problem may exist on your themes.Check them at page level(as Duane said!!). try this..

<%@ Page Title="" Language="C#" MasterPageFile="~/mpage.master" AutoEventWireup="true" CodeFile="index.aspx.cs" Inherits="index" Theme="orangefresh"%>