public class Program : ConsoleProgram
{
    // Declare one property per argument and option.
    
    public string SourceFile { get; set; }
    
    public string DestinationDir { get; set; }
    
    [Option("overwrite")]
    public bool OverwriteExistingFile { get; set; }
    
    [Option("create-dir")]
    public bool CreateDirIfMissing { get; set; }
    
    // Code to execute the console program if all command line args are verified.
    protected int HandleCommand()
    {
        Console.WriteLine($"You want to copy {SourceFile} to {DestinationDir}");
        Console.WriteLine($"Overwrite file if it exists: {OverwriteExistingFile}");
        Console.WriteLine($"Create destination directory if it does not exist: {CreateDirIfMissing}");
        return 0;
    }
    
    // Specify the options and arguments that are accepted by the console app
    protected override IEnumerable<Arg> GetArgs()
    {
        yield return new Argument(nameof(SourceFile))
            .ValidateAsFile(shouldExist: true);
        yield return new Argument(nameof(DestinationDir), optional: true)
            .ValidateAsDirectory();
        yield return new Option("overwrite", "o")
            .UsedAsFlag();
        yield return new Option("create-dir", "c")
            .UsedAsFlag();
    }
    
    public static int Main()
    {
        var program = new Program();
        return program.Run();
    }
}