Question

As you can see in my code below, I am looking to only figure out how to tell whether there has been more than 2 integers into the HouseholdNoTextBox.

private void btnContinue1_Click(object sender, RoutedEventArgs e)
    {
        if (string.IsNullOrEmpty(HouseholdNoTextBox.Text))
        {
            textBlockError1.Visibility = Visibility.Visible;
        }
        if (//HouseholdNoTextBox.Text has > than 2 integers input)
        {
            textBlockError1.Visibility = Visibility.Collapsed; // collapse the first error box if it is visible
            textBlockError2.Visibility = Visibility.Visible; // and make visible the second
        }
    }

Answer 1

Try this

private void btnContinue1_Click(object sender, RoutedEventArgs e)
    {
        if (string.IsNullOrEmpty(HouseholdNoTextBox.Text))
        {
            textBlockError1.Visibility = Visibility.Visible;
        }
int val;
        if (HouseholdNoTextBox.Text.Length>2 && int.TryParse(HouseholdNoTextBox.Text, out val) && val > 99)
        {
            textBlockError1.Visibility = Visibility.Collapsed; // collapse the first error box if it is visible
            textBlockError2.Visibility = Visibility.Visible; // and make visible the second
        }
    }