I’ve got the following code that is supposed to prompt the user that a question has been submitted, and then refresh the page:

protected void ButtonSubmitQuestionClick(object sender, EventArgs e)
{
    -- A whole bunch of code that does stuff --

    //close window
    ScriptManager.RegisterStartupScript(Page, Page.GetType(), "alert", "alert('Your question has been submitted!');window.close();", true);
    Response.Redirect("~/QA_QuestionIntake.aspx");
}

The problem is, the popup never appears, presumably because the page refreshes immediately. How can I make the code pause on the alert until the user presses a button?