title: Value of textbox has changed but aspx page don't update
body: <p>I'm newbie to asp.net, and I've a question. I load for update an aspx page, using querystring, like <code>edit.aspx?Id=123</code>. In the Load event I read the querystring and load the correct record. Through a button, I'd update the record, so I assign to a variables the new values of textboxes, but I don't understand why the new textbox's value aren't considered. I assign value in this manner (e.g. new_email = txemail.text) but system assign at new_email variable the same value of edited record.
  Could someone help me understand what I am making wrong ?
  Thanks in advance.</p>