private void LoadTacGia()
{
gvTacGia.DataSource = null;
gvTacGia.DataSource = TacGiaBUS.LoadTacGia();
gvTacGia.Columns[0].HeaderText = "ID tác giả";
gvTacGia.Columns[1].HeaderText = "Tên tác giả";
gvTacGia.Columns[1].Width = 150;
AddDataBinding();
}