How to control elements on a asp.net master page from child page

Question

I have a few pages on my asp.net website that I would like to turn off a control on the master page. Is there a way to communicate with the master page from a child page?

Answer 1

Here's an example of how to communicate with Master Pages from Child Pages.

In the master page, create a property for the control you wish to access, say a label called lblUser...

public string MyProperty
       {
        set { lblUser.Text = value; }
       }

In the child page, access the property you have just created as in the following example...

((MyMaster)this.Master).MyProperty = "Text changed from Sub Page";

We are able to do this because the Master is simply a class that inherits System.Web.UI.MasterPage.

And the Label.Text property that we created is just a property of the Master class (this name will be the specific name of your current Master Page, in this case MyMaster).

Notice it won't work without a cast to your specific Master Page class and this is because you added a field that does not exist in System.Web.UI.MasterPage, the type of this.Master, but in your specific Master Class.

Answer 2

this.Master.FindControl("controlid").dosomethinghere

Answer 3

You need to use a MasterType directive in your page markup

<%@ MasterType TypeName="Namespace.Etc.MyMasterPage" %>

Then you will be able to access any public properties of the page's master page using

this.Master.PropertyIWantToIntefereWith...

Hope this helps

Answer 4

Easiest way is to setup a property on your master page that handles the on/off functionality when called. Then in your child page set the MasterType directive to get a strongly typed reference to your master page to bypass the need to cast.

Your child page would have:

<%@ MasterType VirtualPath="~/Site1.Master" %>

And to call the property of the master page:

Master.MyLabel = false; // or true

So on your master you could have:

public bool MyLabel
{
    get
    {
        return masterLabel.Enabled;
    }
    set
    {
        masterLabel.Enabled = value;
    }
}

Answer 5

I was looking for something similar, but this solution doesn't seem to work for me. I have a nested master page. Does this work for a nested master? When I implemented, it's not recognizing the control that I added to my master.