private void menuLogin_Click(object sender, EventArgs e)
{
if (frmLogin == null)
{
frmLogin = new FormLogin();
frmLogin.FormClosed += new FormClosedEventHandler(frmLogin_fromClosed);
frmLogin.ShowDialog();
}
else
{
frmLogin.Activate();
}
}
void frmLogin_fromClosed(object sender, FormClosedEventArgs e)
{
frmLogin = null;
}