Changing elements in master page from content page in vb.net

i have a page called a1.aspx, with the Masterpagefile = a1_master.master. Now the master page has its own divs and images for design purposes. I want a way where when i load a1.aspx, certain chosen 's and images should be hidden (visi开发者_如何学Goble=false). how can i do this? how can i change the visibility of a div or an image in the master page from the content page?

Declare an Interface for your master page like:

interface IMasterPageControls{
 Image MyImage { get; }
}

& implement it on your master page:

public class MasterPage : IMasterPageControls{
 public Image MyImage {
   get {  
     // whatever it takes to get the correct object...
     return (Image)this.Page
                           .FindControl("nameOfContainer")
                           .FindControl("nameOfImage");
   }
 }
}

& then in your page you could do:

Image img = (this.Master as IMasterPageControls).MyImage;

this will give you the handle of the image & remove some of the problems which @Matthew mentions...

HTH

Probably you want to use FindControl and Master, like so:

Image myImage = (Image)Master.FindControl("nameOfImage");
myImage.Visible = false;

Check this MSDN page for more information and samples.

Create a property for the master page

public partial class YourMasterPage : System.Web.UI.MasterPage
{
    protected void Page_Load(object sender, EventArgs e)
    { }

    public bool HideImage
    {
        get { return imgYourImage.Visible; }
        set { imgYourImage.Visible = value; }
    }
}

In your content page:

(this.Master as YourMasterPage).HideImage = true;