private async void InsertCampaign_VisibleChanged(object sender, EventArgs e)
{
if (InsertCampaign.Visible)
{
CampaignManager.Enabled = false;
await Task.Run(() =>
{
cms.InitializeConnection();
managers = cms.GetAllEmployees();
});
foreach (var manager in managers)
{
CampaignManager.Items.Add(manager.Name);
}
CampaignManager.Enabled = true;
}
}