// Agregar Sessiones
        protected void btn_guardar_Click(object sender, EventArgs e)
        {
            if (Request.QueryString["id"] != null)
            {
                id = Request.QueryString["id"];

                if (img_up.HasFile)
                {
                    string img  = img_up.FileName;
                    string ruta = "../assets/avatar/" + img;
                    imagen = "../assets/avatar/" + img;
                    img_up.SaveAs(Server.MapPath(ruta));
                }
                if (per.CompararCedula(txt_dni.Text) != null)
                {
                    ClientScript.RegisterStartupScript(this.GetType(), "alerta", "<script>registrado();</script>");
                }
                else if (val.ValidarCedula(txt_dni.Text) == true)
                {
                    int dni = Convert.ToInt32(txt_dni.Text);
                    conn.Sp_EditarPersona
                    (
                        Convert.ToString(dni),
                        txt_nombres.Text,
                        txt_apellidos.Text,
                        txt_telefono.Text,
                        txt_cllp.Text,
                        txt_clls.Text,
                        txt_num.Text,
                        Convert.ToChar("A"),
                        Convert.ToInt32(id),
                        imagen
                    );
                    Response.Redirect("~/Clientes/TableroClientes.aspx");
                }
            }
        }