private void btnExit_Click(object sender, EventArgs e)
{
if (user != null)
{
DialogResult result = MessageBox.Show("Do you want to log out", "Message", MessageBoxButtons.YesNo);
if (result == DialogResult.Yes)
{
user = null;
setBtnHistoryEnable(false);
MessageBox.Show("Log out sucessful");
}
}
else
{
LoginUser loginUser = new LoginUser(this);
loginUser.Show();
}
}