private void loadThanhPho()
{
ddlThanhPho.DataSource = tp.LoadDuLieu();
ddlThanhPho.DataValueField = "ID_ThanhPho";
ddlThanhPho.DataTextField = "TenThanhPho";
ddlThanhPho.DataBind();
}
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
ddlThanhPho.DataSource = tp.LoadDuLieu();
ddlThanhPho.DataTextField = "TenThanhPho";
ddlThanhPho.DataValueField = "ID_ThanhPho";
ddlThanhPho.DataBind();
}
}