How to change the image dynamically in master page(using codebehind)

Posted Date: 25 Dec 2011 Posted By:: Ravi Member Level: Silver Member Rank: 1053 Points: 5 Responses: 1

Hi friends,

my master page is like the following

<asp:ContentPlaceHolder ID="Header" runat="server">
<asp:Image ID="imgHeader" runat="server" ImageAlign="Top" ImageUrl="/IMAGE/ravi1.jpg"/>

</asp:ContentPlaceHolder >

<br />
<br />

<asp:ContentPlaceHolder ID="Content1" runat="server">

</asp:ContentPlaceHolder>

<br />
<br />
<asp:ContentPlaceHolder ID="Footer" runat="server">
<asp:Image ID="Image1" runat="server" ImageAlign= "Bottom" ImageUrl="/IMAGE/redrose1.jpg"/>
</asp:ContentPlaceHolder>

in my content page is

<%@ Page Language="C#" MasterPageFile="~/ImageLayout.Master" AutoEventWireup="true" CodeBehind="Usemas.aspx.cs" Inherits="MasterPageApp.Usemas" %>

<asp:Content ContentPlaceHolderID = "Content1" runat="server">

<br />
<br />
<br />
<br />
<table>
<tr>

<td>
<asp:TextBox ID="txtHeader" runat="server" >

</asp:TextBox>

</td>
<td>
<asp:Button ID="btnHeader" runat="server" Text="Header" onclick="btnHeader_Click" />
</td>

</tr>

<tr>

<td>

<asp:TextBox ID="txtFooter" runat="server">

</asp:TextBox>

</td>
<td>

<asp:Button ID="btnFooter" runat="server" Text="Footer" onclick="btnFooter_Click"/>

</td>
</tr>

<tr>
<td colspan="2">
<asp:Button ID="btnChange" runat="server" Text="ImgCgange"
onclick="btnChange_Click" />
</td>

</tr>

</table>

</asp:Content>

In my content page have 2 texboxes and 2 browse buttons and one image change button.

i got the imageurl path in textbox using browse button

i put the imageurl path in session

Session["Header1"] = txtHeader.Text;
Session["Footer1"] = txtFooter.Text;

then i accessing the session in master page.

MASTER PAGE LOAD EVENT
{
string Head = Convert.ToString(Session["Header1"]);
string Foot = Convert.ToString(Session["Footer"]);

imgHeader.Imageurl=Head;
imgFooter.Imageurl=Foot;

}

But it's not working..

(my logic is i want to change the image in master page based on what i select in the content page textbox )

thanks and regards
Ravi.p

Responses

#648608 Author: Murulidhara K Member Level: Bronze Member Rank: 3616 Date: 26/Dec/2011 Rating: Points: 4
If you want to change the image url which is used in master page, you can always do that by overriding the System.Web.UI.Page class method. protected override void OnPreInit(EventArgs e) { base.OnPreInit(e); // the following line is important MasterPage master = this.Master; // unfortunately, compiler warns us that master is not used // Here find the control to which you want to change the image // using master, which is the master page. You can identify the //control by using content id. }

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