private void btnAddEmployee_Click(object sender, EventArgs e)
 {
     if (!validator.IsValidEmail(txtEmail.Text))
     {
         MessageBox.Show("Please enter a valid email address");
     }
     if (txtContactNumber.TextLength < 10)
     {
         MessageBox.Show("Please enter a valid phone number");
     }
     if (txtName.Text.Length <= 3)
     {
         MessageBox.Show("Please enter a valid name");
     }
     if (txtSurname.Text.Length <= 3)
     {
         MessageBox.Show("Please enter a valid surname");
     }
     if (txtVATID.Text.Length < 10)
     {
         MessageBox.Show("Please enter a valid VAT ID");
     }
     if (txtPassword.Text != txtConfirmPassword.Text)
     {
         MessageBox.Show("Password do not match");
     }
     if (cmbEmployeeType.SelectedIndex == -1)
     {
         MessageBox.Show("Please select an employee type");
     }
     if (validator.IsValidEmail(txtEmail.Text) && txtContactNumber.TextLength >= 10 && txtVATID.Text.Length >= 10 && txtSurname.Text.Length >= 3 && txtName.Text.Length >= 3 && txtPassword.Text == txtConfirmPassword.Text && cmbEmployeeType.SelectedIndex >= 0)
     {
         if (cmbEmployeeType.SelectedIndex == 0)
         {
             employeeLogic.addEmplpoyee(employee: new CallCenterStaff(id: null, firstName: txtName.Text, lastName: txtSurname.Text, phoneNumber: txtContactNumber.Text, email: txtEmail.Text, new Pay("", 600), vatID: txtVATID.Text), password: txtPassword.Text, type: cmbEmployeeType.Text);
             MessageBox.Show(string.Format("Call Centre Staff {0} {1} created!", txtName.Text, txtSurname.Text));
         }
         else
         {
             AuthenticationBusinessLogic authenticationBusinessLogic = new AuthenticationBusinessLogic();
             employeeLogic.addEmplpoyee(employee: new TechnicalStaff(id: null, firstName: txtName.Text, lastName: txtSurname.Text, phoneNumber: txtContactNumber.Text, email: txtEmail.Text, new Pay("", 600), vatID: txtVATID.Text), password: authenticationBusinessLogic.Encipher(txtPassword.Text, 12), type: cmbEmployeeType.Text);
             MessageBox.Show(string.Format("Technician {0} {1} created!", txtName.Text, txtSurname.Text));
         }
     }
 }