Get All Web Controls of a Specific Type on a Page

Question

I have been pondering how I can get all controls on a page and then perform a task on them in this related question:

How to Search Through a C# DropDownList Programm

Answer 1

You can use recursive logic to get all of the controls, like this:

private void PopulateSelectList(Control parentCtrl, List selectList)
{
    foreach (Control ctrl in parentCtrl.Controls)
    {
        if (ctrl is DropDownList)
        {
            selectList.Add(((DropDownList)ctrl);
            continue;
        }
        FindAllControls(ctrl, selectList);
    }
}