using System;
using System.Data;
using System.Configuration;
using System.Collections;
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 partial class ChangeTheme : System.Web.UI.Page, ICallbackEventHandler
{
protected void Page_PreInit(object sender, EventArgs e)
{
//If theme is null or not changed by user use Default theme
if (String.IsNullOrEmpty(Convert.ToString(Session["Theme"])))
Page.Theme = "Default";
else
Page.Theme = Convert.ToString(Session["Theme"]);
}
protected void Page_Load(object sender, EventArgs e)
{
//JavaScript Callbacks
ClientScriptManager scriptManager = Page.ClientScript;
String cbReference = scriptManager.GetCallbackEventReference(this, "returnValue", "ReceiveServerData", "context");
String callbackScript = "function CallServer(returnValue, context) {" + cbReference + "; }";
scriptManager.RegisterClientScriptBlock(this.GetType(), "CallServer", callbackScript, true);
TextBox1.Text = DateTime.Now.ToString();
}
#region ICallbackEventHandler Members
//Return value from the server to the client
string ICallbackEventHandler.GetCallbackResult()
{
return Convert.ToString(Session["Theme"]);
}
//Get the theme name from the javascript function
public void RaiseCallbackEvent(string eventArgument)
{
Session["Theme"] = eventArgument.Trim();
}
#endregion
}
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ChangeTheme.aspx.cs"
Inherits="ChangeTheme" %>
Theme Switcher
The style set for the background body and the textbox.
You can see that, the time is not changed when we select the color.
This is done from the javascript.
To make apply the theme press the button Apply Theme.
Source Code
