private Control FindRecursively(Control c, string strControlName)
{
    if (c.Name == strControlName)
        return c;

    foreach (Control cf in c.Controls)
    {
        Control cTemp = FindRecursively(cf, strControlName);
        if (cTemp != null)
            return cTemp;
    }
    return null;
}

private Control FindNotRecursively(Control c, string strControlName)
{
    if (c.Name == strControlName)
        return c;

    Stack stack = new Stack();
    stack.Push(c);

    while (stack.Count > 0)
    {
        Control cTemp = stack.Pop();
        if (cTemp.Name == strControlName)
            return cTemp;

        foreach (Control cf in cTemp.Controls)
            stack.Push(cf);
    }
    return null;
}

Panel currentPanel = new Panel();
this.Controls.Add(currentPanel);

for (int i = 0; i < 40; i++)
{
    Panel p = new Panel();
    for (int i2 = 0; i2 < 80; i2++)
    {
        Label l = new Label();
        p.Controls.Add(l);
    }
    currentPanel.Controls.Add(p);
    currentPanel = p;
}

Button btn1 = new Button();
btn1.Name = "button1";
currentPanel.Controls.Add(btn1);

// Zahlen in Millisekunden
// Erster Durchlauf
Recursively: 4
!Recursively: 1
// Folgende Durchläufe
Recursively: 1
!Recursively: 0