private void AddBtn_Click(object sender, EventArgs e)
{
try
{
string obj = String.Format("{0}|{1}|{2}|{3}|{4}|{5}", nameSt.Text, numberSt.Text
, _classSt.Text, boy.Checked, countrySt.Text, ageSt.Text);
StudentVM.AddVM(obj);
}
catch (Exception er)
{
MessageBox.Show("Lỗi: " + er.Message);
}
render();
}