protected void Page_Load(object sender, EventArgs e)
        {
            CountryCityManager countryCityManager = new CountryCityManager();
            countryCityGridView.DataSource= countryCityManager.ShowCountryCity();
            countryCityGridView.DataBind();

            if (!IsPostBack)
            {
                countryDropDownList.DataTextField = "CountryName";
                countryDropDownList.DataValueField = "CountryName";
                countryDropDownList.DataSource = countryCityManager.ShowCountry();
                countryDropDownList.DataBind();
            }
        }
 protected void Page_Load(object sender, EventArgs e)
 {
     CountryCityManager countryCityManager = new CountryCityManager();
     viewCountryGridView.DataSource = countryCityManager.ShowCountryCity();
     viewCountryGridView.DataBind();
 }