private async void btnSaveIssue_Click(object sender, RoutedEventArgs e)
{
await SqliteContext.CreateIssueAsync(new Issue { CustomerId = await SqliteContext.GetCustomerIdByNames(cmbCustomer.SelectedItem.ToString()), Titel = tbTitel.Text, Description = tbDescription.Text, Category = cbCategory.SelectedItem.ToString() });
tbTitel.Text = "";
cbCategory.Text = "";
tbDescription.Text = "Case Added";
}