How Do I Redirect To A Page From A Class File?

public static SqlConnection OpenConnection()
        {
            try
            {
                if (HttpContext.Current.Session["DATABASE"] != null && HttpContext.Current.Session["USERNAME"] != null && HttpContext.Current.Session["PASSWORD"] != null && HttpContext.Current.Session["SERVERNAME"] != null)
                {
                    cn = new SqlConnection("uid=" + HttpContext.Current.Session["USERNAME"].ToString() + ";pwd=" + HttpContext.Current.Session["PASSWORD"].ToString() + ";server=" + HttpContext.Current.Session["SERVERNAME"].ToString() + ";database=" + HttpContext.Current.Session["DATABASE"].ToString() + "");
                    if (cn.State == ConnectionState.Closed)
                    {
                        cn.Open();
                    }

                }
                else
                {
                    HttpContext.Current.Response.Redirect("~/Login.aspx");

                }
                return cn;

            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
        }