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

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?

Ahmad Mageed

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;
    }
}

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

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.

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.

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

来源：https://stackoverflow.com/questions/1092784/how-to-control-elements-on-a-asp-net-master-page-from-child-page

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ASP.NET

master-pages