private void tabDoan_AddBtn_Click(object sender, EventArgs e)
{
DoanKhach_Form form = _serviceProvider.GetRequiredService <DoanKhach_Form>();
var main = this.Location;
form.Location = new Point((main.X + 10), (main.Y + 10));
form.Show();
}
private void button1_Click(object sender, EventArgs e)
{
HanhKhach_Form HK = _service.GetRequiredService <HanhKhach_Form>();
HK.Show();
DoanKhach_Form DK = _service.GetRequiredService <DoanKhach_Form>();
DK.Show();
}