User Selectable Themes in ASP.NET and C#

Tutorial showing how you can let your users choose how a page looks, using ASP.NET Themes. C# version.

For this example, there will be three simple themes to choose from, and they will be chosen from a drop-down menu.
First, add an ASP.NET folder > Theme for each theme you will create. Within each of these folders, you will need a CSS file and a Skin file.
Example CSS file:

td.title { font-size: 1em; text-align: center; font-family: verdana; font-size: x-large; font-weight: bolder; color: Navy; } table.header { background-color: #cee9ff; } h1 { font-size: large; color: Navy; } h2 { font-family: Verdana; font-size: medium; margin-top: 30; color: Navy; } p { font-family: Verdana; font-size: small; color: Navy; text-align: left; } hr { border: 0; border-top: 2px solid Navy; height: 2px; }

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Example skin file:

<asp:dropdownlist runat="server" ForeColor="white" BackColor="Blue" />

Master Page:

<form id="form1" runat="server"> <table width="100%" cellspacing="0" cellpadding="0" border="0" class="header"> <tr> <td class="title">Switchable Themes Example</td> </tr> <tr> <td><hr /></td> </tr> <tr> <td> <asp:contentplaceholder id="ContentPlaceHolder1" runat="server"> </asp:contentplaceholder> </td> </tr> <tr> <td><hr /></td> </tr> </table> </form>

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Content ASPX page:

<%@ Page Language="C#" MasterPageFile="~/Master1.master" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" Title="User Selectable Themes" StylesheetTheme="Blue" %> <script runat="server"> public void Page_PreInit() { // Sets the Theme for the page. this.Theme = "Blue"; if (Request.Form != null && Request.Form.Count > 0) this.Theme = this.Request.Form[4].Trim(); } </script> <asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server"> <h1 id="title1">Switchable Themes on a Page</h1><br /> <h2 id="title2"> This is a custom page within a master page.</h2> <p>Choose from the drop-down menu below to change the color of this page.</p> <br /><br /> <asp:dropdownlist id="changeThemes" runat="server" autopostback="true"> <asp:listitem value="Blue">Change the page to blue!</asp:listitem> <asp:listitem value="Red">Change the page to red!</asp:listitem> <asp:listitem value="Green">Change the page to green!</asp:listitem> </asp:dropdownlist> </asp:Content>

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