protected void ChangeData(object sender, EventArgs e)
        {
            HttpCookie userCookie;
            userCookie = Request.Cookies["UserID"];
            User_Class usuario_sesion = new User_Class();
            usuario_sesion = usuario_sesion.getUser(userCookie.Value);

            if (Email.Text != "")
            usuario_sesion.Email = Email.Text;
            if (Name.Text != "")
            usuario_sesion.Name = Name.Text;
            if (Surname.Text != "")
            usuario_sesion.Surname = Surname.Text;
            if (RadioButtonList1.Items[0].Selected) usuario_sesion.Gender = 'F';
            else if(RadioButtonList1.Items[1].Selected) usuario_sesion.Gender = 'M';
            if (ImageUrl.Text != "") usuario_sesion.Image_url = ImageUrl.Text;

            userCookie = new HttpCookie("UserID", usuario_sesion.Nick);
            userCookie.Expires = DateTime.Now.AddMonths(1);
            Response.Cookies.Add(userCookie);
            if(usuario_sesion.updateUser())
            Label1.Text = "Done!";
        }