How to modify the value of a master page control on a page page after referencing the master page practical tips

The specific conditions are as follows:
1. First, the page must refer to the master page to be modified;
2. Create a strongly typed reference to the master page by setting the page directive @mastertype on the page page, specifying a virtual path to generate a strongly typed file such as:

Copy Code code as follows:

<%@ MasterType virtualpath= "~/demo.master"%>

3. Add a public property to the master page, and the set value is assigned to the master page control, for example:

Copy Code code as follows:

public string PageTitle
{
set {
This. Labpagetitle.text = value;
}
}

After the above conditions are met, you can modify the value of the control above the master page on the page page, for example:

Copy Code code as follows:

protected void Page_Load (object sender, EventArgs e)
{
if (! IsPostBack)
{
This. Master.pagetitle = "Page modifies the value of the master page control";
}
}

The Labtitle control value on the master page is set to the page page to modify the master page control's value.