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Friday, 25 July 2014

Dynamically Change Page/Master Page background Image in Asp.Net Using C#

7/25/2014 - By Pranav Singh 0

This article will show you how you can how you can change the page background dynamically on the bases of role. In this article I will show you how you can change the background image of the page on selection of role from dropdown list. In this I have placed the dropdown list on masterpage of the project.

So for this article first we will create a new asp.net application and add a dropdown list with curtain role. Now here is the master page code shown below.

<%@ Master Language="C#" AutoEventWireup="true" CodeBehind="Site.master.cs" Inherits="PageBackground.SiteMaster" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head runat="server">
    <title> Dynamically Change Page/Master Page background Image in Asp.Net Using C#
</title>
    <link href="~/Styles/Site.css" rel="stylesheet" type="text/css" />
    <asp:ContentPlaceHolder ID="HeadContent" runat="server">
    </asp:ContentPlaceHolder>
</head>
<body style="background-image: url(<%= backgroundImage %>)">
    <form runat="server">
    <div class="page">
        <div class="header">
            <div class="title">
                <h1>
                    My ASP.NET Application
                </h1>
            </div>
            <div class="loginDisplay">
                <asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True"
                    onselectedindexchanged="DropDownList1_SelectedIndexChanged">
                    <asp:ListItem Value="1">Admin</asp:ListItem>
                    <asp:ListItem Value="2">User</asp:ListItem>
                </asp:DropDownList>
            </div>
            <div class="clear hideSkiplink">
            </div>
        </div>
        <div>
            <asp:ContentPlaceHolder ID="MainContent" runat="server"/>
        </div>
        <div class="clear">
        </div>
    </div>
    <div class="footer">
       
    </div>
    </form>
</body>
</html>

Now just check the body tag of the above code. In this tag I have added background-image with a public variable whose value we change on the dropdown list index change.

<body style="background-image: url(<%= backgroundImage %>)">

So here is the code of master page.

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

namespace PageBackground
{
    public partial class SiteMaster : System.Web.UI.MasterPage
    {
        public string backgroundImage = "";
        protected void Page_Load(object sender, EventArgs e)
        {

        }
        protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (DropDownList1.SelectedValue == "1")
            {
                backgroundImage = "image/Chrysanthemum.jpg";
            }
            else
            {
                backgroundImage = "image/Desert.jpg";
            }
        }
    }
}

Now run the application to check the output.

OUTPUT 1



OUTPUT 2



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