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Posted 19 Jun 2006


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Dynamic Themes in ASP.NET 2.0 (C#)

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4.79 (49 votes)
19 Jun 2006CPOL
A step by step guide to create dynamic themes in ASP.NET 2.0.

Sample Image - dynamicThemes.jpg


ASP.NET 2.0 makes dynamic themes really easy. No need to envy someone having cool multiple themes, you can have your own instantly! This article gives you step by step instructions on how to make dynamic themes in C#. You can try this code out with the Personal Web Site Starter Kit.

The result

Live demo is available here. Click on "change themes" on the top left corner, under the logo.

The code

  1. Step 1: Under the App_Code folder, we add a class file named Theme.cs:
  2. public class Theme
        private string _name;
        public string Name
            get { return _name; }
            set { _name = value; }
        public Theme(string name)
            Name = name;
  3. Step 2: Under the App_Code folder, we add a ThemeManager class file named ThemeManager.cs. This will list all the available themes under the /App_Themes folder.
  4. using System;
    using System.Data;
    using System.Configuration;
    using System.Web;
    using System.Web.Security;
    using System.Web.UI;
    using System.Web.UI.WebControls;
    using System.Web.UI.WebControls.WebParts;
    using System.Web.UI.HtmlControls;
    using System.Collections;
    using System.Collections.Generic;
    using System.IO;
    public class ThemeManager
    #region Theme-Related Method
        public static List<Theme> GetThemes()
            DirectoryInfo dInfo = new DirectoryInfo(
            DirectoryInfo[] dArrInfo = dInfo.GetDirectories();
            List<Theme> list = new List<Theme>();
            foreach (DirectoryInfo sDirectory in dArrInfo)
                Theme temp = new Theme(sDirectory.Name);
            return list;
  5. Step 3: Comment out any pre-defined themes such as <!--<span class="code-comment"><pages styleSheetTheme="Black"/>--></span> in the web.config. You don't need this because the application level default theme will be specified in the BasePage class in Step 6.
  6. Step 4: In you master page, such as Default.master, add a data source and a radiobutton list. You can use a dropdownlist if you would prefer that.
  7. <asp:ObjectDataSource ID="ThemeDataSource" runat="server" 
     SelectMethod="GetThemes" TypeName="ThemeManager" ></asp:ObjectDataSource>
    <asp:RadioButtonList ID="strTheme" runat="server" DataTextField=name 
     DataValueField=name OnSelectedIndexChanged="strTheme_SelectedIndexChanged" 
     OnDataBound="strTheme_DataBound" DataSourceID="ThemeDataSource" 
     AutoPostBack=true RepeatDirection=Horizontal />
  8. Step 5: In the master page code-behind, such as Default.master.cs, add these methods:
  9. protected void strTheme_DataBound(object sender, EventArgs e)
        strTheme.SelectedValue = Page.Theme;
    protected void strTheme_SelectedIndexChanged(object sender, EventArgs e)
        Session.Add("MyTheme", strTheme.SelectedValue);
  10. Step 6: Add the BasePage class under App_Code, and specify the default theme. Here, we use "White".
  11. using System;
    using System.Data;
    using System.Configuration;
    using System.Web;
    using System.Web.Security;
    using System.Web.UI;
    using System.Web.UI.WebControls;
    using System.Web.UI.WebControls.WebParts;
    using System.Web.UI.HtmlControls;
    public class BasePage : System.Web.UI.Page
        protected override void OnPreInit(EventArgs e)
            if (Session["MyTheme"] == null)
                Session.Add("MyTheme", "White");
                Page.Theme = ((string)Session["MyTheme"]);
                Page.Theme = ((string)Session["MyTheme"]);
  12. Step 7: Inherit all the pages using the dynamic theme from BasePage:
  13. public partial class Default_aspx : BasePage

Happy programming!


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

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Comments and Discussions

QuestionThemes Pin
Sagar Pulidindi3-Jun-13 19:32
MemberSagar Pulidindi3-Jun-13 19:32 
Questionvote of 5 Pin
Member 878749724-Aug-12 7:45
MemberMember 878749724-Aug-12 7:45 
GeneralMy vote of 5 Pin
Md. Mainuddin30-Nov-11 4:06
MemberMd. Mainuddin30-Nov-11 4:06 
QuestionMy Vote of 5 Pin
Praveen Kullu27-Nov-11 23:32
MemberPraveen Kullu27-Nov-11 23:32 
GeneralMy Vote of 5 Pin
RaviRanjanKr20-Nov-11 20:46
professionalRaviRanjanKr20-Nov-11 20:46 
GeneralMy vote of 5 Pin
Niranjankr15-Nov-11 0:10
MemberNiranjankr15-Nov-11 0:10 
GeneralDemo link is broken Pin
Michael Freidgeim17-Jun-11 17:21
MemberMichael Freidgeim17-Jun-11 17:21 
GeneralMy vote of 1 Pin
sheradhakar17-Feb-11 23:02
Membersheradhakar17-Feb-11 23:02 
GeneralReally nice article.... best demonstration. Pin
PrathameshP23-Dec-09 23:18
MemberPrathameshP23-Dec-09 23:18 
GeneralPerfect! Pin
netizenk18-Jun-09 12:05
professionalnetizenk18-Jun-09 12:05 
Generaldynamic web c# Pin
magdyeltahaan26-May-09 22:08
Membermagdyeltahaan26-May-09 22:08 
QuestionChange look and feel of portions of the page based on selected theme. Pin
Sudipta Chaudhari24-Nov-08 21:35
MemberSudipta Chaudhari24-Nov-08 21:35 
QuestionPlease help me.... Pin
Abhishek Sur14-Nov-07 1:10
professionalAbhishek Sur14-Nov-07 1:10 
GeneralDynamic Themes Pin
webert125-Oct-07 10:13
Memberwebert125-Oct-07 10:13 
GeneralProfiles are better than sessions Pin
wali10117-Oct-07 6:01
Memberwali10117-Oct-07 6:01 
Questionpostback Pin
iron10623-Jul-07 2:59
Memberiron10623-Jul-07 2:59 
QuestionHelp me! Server.MapPath Pin
cuongnp3-Jul-07 14:23
Membercuongnp3-Jul-07 14:23 
AnswerRe: Help me! Server.MapPath Pin
cuongnp3-Jul-07 17:45
Membercuongnp3-Jul-07 17:45 
GeneralAny way to persist the state Pin
Liquid Len30-Apr-07 9:25
MemberLiquid Len30-Apr-07 9:25 
GeneralRe: Any way to persist the state [modified] Pin
D. Kuzmanovic4-Dec-08 22:33
MemberD. Kuzmanovic4-Dec-08 22:33 
QuestionExample Pin
M-Daraghmeh8-Apr-07 1:07
MemberM-Daraghmeh8-Apr-07 1:07 
Generalhamed ( Elixir ) Pin
hamedkocholo31-Mar-07 23:22
Memberhamedkocholo31-Mar-07 23:22 
QuestionUploading a new theme/skin Pin
AlexanderViken29-Jan-07 8:56
MemberAlexanderViken29-Jan-07 8:56 
AnswerRe: Uploading a new theme/skin Pin
Juba22-Feb-07 9:06
MemberJuba22-Feb-07 9:06 
GeneralNice Article Pin
Manish Pansiniya13-Dec-06 18:51
MemberManish Pansiniya13-Dec-06 18:51 

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