Help - report - C#

Question

Hi friends,
I am trying to make a dynamic report (by report viewer - c#) to app.  but i have few questions:
1. How i can enter dynamic text (from the code, i use in Reporter Binding Source ) to the header?
(if i try to put invisible text box in the page and copy the text form this Textbox to the header the text appear only in the first  page).
2. How can i put unknown number of pic in the report (the user select the number of the pic)?
thanks,
Ofir