UseTryParseAddress.cs

public class TaskStateCommand : ExtensionCommandBase
{
    [Argument(Help = "The Task instance address.")]
    public string Address { get; set; }
    public override void Invoke()
    {
        if (string.IsNullOrEmpty(Address) && !Value.HasValue)
        {
            WriteLine("Missing Task reference address or state value..." + Environment.NewLine);
            return;
        }

        ...

            if (!TryParseAddress(Address, out var address))
            {
                WriteLine("Numeric value expected: either a task address or -v <state value>..." + Environment.NewLine);
                return;
            }