从子控件访问父控件 - ASP.NET C#

public string ParentText
{
    get { return this.parentLabel.Text; }
    set { this.parentLabel.Text = value; }
}

protected void Button1_Click(object sender, EventArgs e)
{
    // Find the parent control
    Control parentControl = this.Parent;

    // Cast the parent control to the appropriate type
    MyCustomControl customControl = parentControl as MyCustomControl;

    // Access the parent control's property or method
    customControl.ParentText = "Hello from child control!";
}