ASP.NET - Recursive find control within a parent.

gistfile1.cs

private Control FindField(Control source, string id)
{
    Control target = source.FindControl(id);
    if (target != null) return target;
    foreach (Control child in source.Controls)
    {
        target = this.FindField(child, id);
        if (target != null) return target;
    }
    return null;
}