The control you have at the backend is procedural code. You can not
control the browser. If you want the response to go to another
frame you have to handle the framing from the client side. What you could do is on the client side run java script or vbscript. Here is a link to two different articles that give explanations about how to redirect with java script and vbscript.

http://support.microsoft.com/default.aspx?scid=KB;EN-US;Q156315&
http://www.aspfaq.com/show.asp?id=2052


>I have an ImageButton. And when I click on it, I want to open a new page in
>another frame. With this code, I have now, It's open in same frame. Please
>help
>
>

>private void ImageButton1_Click(object sender,
>System.Web.UI.ImageClickEventArgs e)
>{
>    Response.Redirect("UserAccount.aspx", true);
>}
>