I'm confused. Are you trying to place 5 copies of textbox1 onto a page or are you trying to change textbox1 while it's on the page?
If it's putting 5 copies onto the page, you can - but not in the way you've got it (think about using an array with each textbox being placed onto the page at a different position).
If it's to change the contents then you can
[code]
for(int i = 0; i < 5; ++i)
{
textbox1.Text += foo[i] + "-";
}
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