How to access content page controls from master page in asp.net

Question

it is very easy to access master page control from content page like

protected void Page_Load(object sender, EventArgs e)
{
    // content page load event
    DropDownList thisDropDown = this.Master.FindControl("someDropDown") as DropDownList;
    userLabel.Text = thisDropDown.SelectedValue;
}

but how could i access controls of content page from master page. suppose a textbox there in content page and one button is there in master page. i want that when i will click on master page button then i want to show the text of textbox in the content page in the label of master page. how to achieve it. please help me with code sample. thanks.

Answer 1

In master page button click event should access page contents by:-

protected void Button1_Click(object sender, EventArgs e)
{
    TextBox TextBox1 = (TextBox)ContentPlaceHolder1.FindControl("TextBox1");
    if (TextBox1 != null)
    {
        Label1.Text = TextBox1.Text;
    }
}

Answer 2

It's been a while, but I believe you can do so by using the ContentPlaceHolder as a reference:

Control control = this.myContentPlaceHolder.FindControl("ContentPageControlID");