Asp.Net: Generic Recursive FindControl Method

Question:

How to find a control in the whole page not just in the child collection?
How to find recursively a control in the child hierarchy of a control?

Answer:

You create a little recursive method passing in the parent and a condition (Predicate delegate on controls) that tests what you want to find.

Here is an example

public static T FindFirst<T>(Control ctrl, Predicate<Control> predicate) where T : Control 
{ 
    if (predicate(ctrl)) 
    { 
        return ctrl as T; 
    } 
    foreach (Control innerCtrl in ctrl.Controls) 
    { 
        T found = FindFirst<T>(innerCtrl , predicate);
        if (found != null) 
        {
            return found; 
        } 
    } 
    return null; 
}