private void BtnAddNew_Click(object sender, RoutedEventArgs e)
{
Class classes = (Class)comboBoxClass.SelectedItem;
if (txtboxFirstName != null || txtboxLastName != null)
{
try
{
DbOperations.AddNewChild(txtboxFirstName.Text, txtboxLastName.Text, int.Parse(txtboxAge.Text), classes.Id);
ClearTextbox();
Updatelists();
UpdatedMessage();
}
catch (PostgresException ex)
{
MessageBox.Show(ex.Message);
}
}
}