redirect to login page

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C#3.0

C#

In my application im poping up an error message to the users though modal popup.Now i want to redirect the user to login page upon clicking ok.the problem now is that the user gets no view of the message and login page is show;

if (sqlReader.HasRows)
           {
               ddlistschool.DataSource = sqlReader;
               ddlistschool.DataTextField = "College";
               ddlistschool.DataValueField = "College";
               ddlistschool.DataBind();

           }
           else
           {
               lbldisplay.Text = "Test";
               UpdatePanel2.Update();
               Unauthenticated_popup.Show();
               Response.Redirect("Login.aspx");

I only want to redirect the user to the login page after the user has read the meassage and click ok on the modal up..any ideas of achieving this

Thanks