private void btnThemKhachHang_Click(object sender, EventArgs e)
{
frmThemSuaKH frm = new frmThemSuaKH();
frm.themkhachhang += HamThemKhachHang;
frm.ShowDialog();
}
private void btnSuaKhachHang_Click(object sender, EventArgs e)
{
MaKH = dgvKhachHang.SelectedRows[0].Cells["colMaKhachHang"].Value.ToString();
frmThemSuaKH frm = new frmThemSuaKH(MaKH);
frm.suakhachhang += HamSuaKhachHang;
frm.ShowDialog();
}