private void ShowAllAddedMobile()
        {
            MobileManager mobileManager = new MobileManager();

            MobileGridView.DataSource = mobileManager.GetAllAddedMobile();
            MobileGridView.DataBind();
        }
        private void ShowAllMobile(int lower, int higher)
        {
            MobileManager mobileManager = new MobileManager();

            MobileGridView.DataSource = mobileManager.GetAllMobile(lower, higher);
            MobileGridView.DataBind();
        }