show alert box then redirect to next page

protected void Page_Load(object sender, EventArgs e)
   {
       if (!IsPostBack)
       {
           LinkButton1.Attributes.Add("onClick", "javascript:alert('Record Saved Successfully');");
       }
   }
   protected void LinkButton1_Click(object sender, EventArgs e)
   {

       Response.Redirect("Default.aspx");
   }