private void ManagerLogin_Click(object sender, EventArgs e)
{
string username = tBManagerUsername.Text;
string password = tBManagerPassword.Text;
var v = ManagerController.AuthenticateManager(username, password);
if (v != null)
{
MessageBox.Show("user valid");
this.Hide();
new Manager().Show();
}
else
{
MessageBox.Show("user not valid");
}
}