private async void InsertCampaignButton_Click(object sender, EventArgs e)
        {
            if (CheckNulls(InsertCampaign))
            {
                DisableControls(InsertCampaign);
                Campaign c = new Campaign()
                {
                    ID          = int.Parse(CampaignID.Text),
                    Budget      = long.Parse(CampaignBudget.Text),
                    Date        = CampaignDate.Value,
                    Description = CampaignDescription.Text,
                    Name        = CampaignName.Text,
                    Location    = CampaignLocation.Text
                };
                Employee manager = managers[CampaignManager.SelectedIndex];
                await Task.Run(() =>
                {
                    cms.InsertCampaign(c);
                    cms.SetCampaignManager(c, manager);
                    cms.TerminateConnection();
                });

                EnableControls(InsertCampaign);
                Close();
            }
        }