How to find control within ContentPlaceholder and placeholder?

Question

I am adding controls dynamically to PlaceHolder which within ContentPlaceHolder

var t = (ContentPlaceHolder)Master.FindControl("ContentPlaceHolder1");
var t1 = (PlaceHolder)mpContentPlaceHolder.FindControl("PlaceHolderName");

var t2 = (DropDownList)t1.FindControl("ControlID");

It looks like I am missing something because t2 is always null

Answer 1

If you are adding controls dynamically and you are trying to find the control after postback you will not find them.