private void btnCus_Click(object sender, EventArgs e)
{
var frm_KhachHang = new dsKhachHang();
frm_KhachHang.Location = this.Location;
frm_KhachHang.StartPosition = FormStartPosition.Manual;
frm_KhachHang.FormClosing += delegate { this.Show(); };
frm_KhachHang.Show();
this.Hide();
}
private void btnCus_Click(object sender, EventArgs e)
{
Form f = new dsKhachHang();
f.Show();
}