Hi,
if you know that you have fix master page hierarchy then you can easily find the control like ,
(this.Page.Master.Master.FindControl("textbox1") as TextBox).Text
In above example my parent master page contain one text box with
textbox1 as it's
ID and i would like to find the
Text property of that text box.
Hope from this code you will get idea about how you can get your control information.
Thanks
-Amit Gajjar.