private void LoginGuestBtn_Click(object sender, EventArgs e)
        {
            MessageBox.Show("Log In As Guest Success");
            CalculatorForm calculatorForm = new CalculatorForm("User");

            calculatorForm.Show();
            this.Visible = false;
        }
 private void button1_Click(object sender, EventArgs e)
 {
     if (LoginTB.Text == "Manager" && PasswordTB.Text == "Password")
     {
         MessageBox.Show("Log In Success");
         CalculatorForm calculatorForm = new CalculatorForm("Manager");
         calculatorForm.Show();
         this.Visible = false;
     }
     else
     {
         MessageBox.Show("Log In Failed");
     }
 }