User Selectable Themes in ASP.NET and C#

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User Selectable Themes in ASP.NET and C#

ASP.NET User Interface and Themes Tutorial

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:

<tr>

<td class="title">Switchable Themes Example</td>

</tr>
<tr>

</tr>
<tr>

</tr>
<tr>

</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 />

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>

<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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