/// <summary>Initializes a new instance of the <see cref="RegionsForm"/> class.</summary>
/// <param name="con">The con.</param>
/// <exception cref="ArgumentNullException">con</exception>
public RegionsForm(NpgsqlConnection con)
{
this.con = con ?? throw new ArgumentNullException(nameof(con));
regionsService = new RegionsService(con);
InitializeComponent();
// add test data to work with. AddTestData();
}