private void AddCandidateBtn_Click(object sender, EventArgs e)
{
var controller = new CandidatesController();
var firstName = FirstNameTxtBox.Text;
var lastName = LastNameTxtBox.Text;
var phone = PhoneNumberTxtBox.Text;
var email = EmailTxtBox.Text;
controller.AddCandidate(firstName, lastName, email, phone, Resume);
}