private void FormLaiKey_Load(object sender, EventArgs e)
{
LaiKey lk = new LaiKey();
lk.Key = "1";
lk.Lai = "2";
bool isok = lk.Equals(lk);
txtMSg.Text = isok.ToString();
}
public override bool Equals(object obj)
{
LaiKey lk = (LaiKey)obj;
return(lk.Lai == lk.Key);
}