private async void InserPersonButton_Click(object sender, EventArgs e)
        {
            if (CheckNulls(InsertPerson))
            {
                DisableControls(InsertPerson);
                Person p = new Person()
                {
                    Name     = PersonName.Text,
                    Mail     = PersonMail.Text,
                    Location = PersonLocationList.Items.Cast <string>().ToArray(),
                    SSN      = long.Parse(PersonSSN.Text),
                };
                await Task.Run(() =>
                {
                    cms.InitializeConnection();
                    switch (PersonType.SelectedItem as string)
                    {
                    case "Volunteer":
                        cms.InsertVolunteers((Volunteer)p);
                        break;

                    case "Beneficiary":
                        cms.InsertBeneficiary((Beneficiary)p);
                        break;

                    case "Recepient":
                        cms.InsertReceipeients((Recepient)p);
                        break;

                    case "Employee":
                        cms.InsertEmployee((Employee)p);
                        break;
                    }
                });

                EnableControls(InsertPerson);
                Close();
            }
        }