Well yes. Typically you can reference a control by it's ID, so if you
have a textbox webcontrol on the page that's id is txtFirstBox, you can
reference that control by that name. For instance you can access the
text property of the text box by txtFirstBox.Text.
Another way you can access a control on the page is through the find
command. You can do this like so - Page.FindControl("controlname").
This is how you can find controls that are in the page collection
(finding controls contained in other web controls can be found in a
similar manner).
You can access how many web controls are on the page through
Page.Controls.Count.
Hope this helps,
Darren Kopp