C# WinApp อยากจะลองเขียนโปรแกรมที่ใช้งาน google drive ดูครับต้องเริ่มยังไงบ้าง

using Google.Apis.Auth.OAuth2;
using Google.Apis.Drive.v3;
using Google.Apis.Drive.v3.Data;
using Google.Apis.Services;
using Google.Apis.Util.Store;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace DriveQuickstart
{
    class Program
    {
        // If modifying these scopes, delete your previously saved credentials
        // at ~/.credentials/drive-dotnet-quickstart.json
        static string[] Scopes = {  DriveService.Scope.DriveReadonly };
        static string ApplicationName = "Drive API .NET Quickstart";

        static void Main(string[] args)
        {
            UserCredential credential;

            using (var stream =
                new FileStream("client_secret.json", FileMode.Open, FileAccess.Read))
            {
                string credPath = System.Environment.GetFolderPath(
                    System.Environment.SpecialFolder.Personal);
                credPath = Path.Combine(credPath, ".credentials/drive-dotnet-quickstart.json");

                credential = GoogleWebAuthorizationBroker.AuthorizeAsync(
                    GoogleClientSecrets.Load(stream).Secrets,
                    Scopes,
                    "user",
                    CancellationToken.None,
                    new FileDataStore(credPath, true)).Result;
                Console.WriteLine("Credential file saved to: " + credPath);
            }

            // Create Drive API service.
            var service = new DriveService(new BaseClientService.Initializer()
                {
                    HttpClientInitializer = credential,
                    ApplicationName = ApplicationName,
                });

            // Define parameters of request.
            FilesResource.ListRequest listRequest = service.Files.List();
            listRequest.PageSize = 10;
            listRequest.Fields = "nextPageToken, files(id, name)";

            // List files.
            IList<Google.Apis.Drive.v3.Data.File> files = listRequest.Execute()
                .Files;
            Console.WriteLine("Files:");
            if (files != null && files.Count > 0)
            {
                foreach (var file in files)
                {
                    Console.WriteLine("{0} ({1})", file.Name, file.Id);
                }
            }
            else
            {
                Console.WriteLine("No files found.");
            }
            Console.Read();

        }
    }
}

Imports Google.Apis.Auth.OAuth2
Imports Google.Apis.Drive.v3
Imports Google.Apis.Drive.v3.Data
Imports Google.Apis.Services
Imports Google.Apis.Util.Store
Imports System.Collections.Generic
Imports System.IO
Imports System.Linq
Imports System.Text
Imports System.Threading
Imports System.Threading.Tasks

Namespace DriveQuickstart
	Class Program
		' If modifying these scopes, delete your previously saved credentials
		' at ~/.credentials/drive-dotnet-quickstart.json
		Shared Scopes As String() = {DriveService.Scope.DriveReadonly}
		Shared ApplicationName As String = "Drive API .NET Quickstart"

		Private Shared Sub Main(args As String())
			Dim credential As UserCredential

			Using stream = New FileStream("client_secret.json", FileMode.Open, FileAccess.Read)
				Dim credPath As String = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal)
				credPath = Path.Combine(credPath, ".credentials/drive-dotnet-quickstart.json")

				credential = GoogleWebAuthorizationBroker.AuthorizeAsync(GoogleClientSecrets.Load(stream).Secrets, Scopes, "user", CancellationToken.None, New FileDataStore(credPath, True)).Result
				Console.WriteLine(Convert.ToString("Credential file saved to: ") & credPath)
			End Using

			' Create Drive API service.
			Dim service = New DriveService(New BaseClientService.Initializer() With { _
				Key .HttpClientInitializer = credential, _
				Key .ApplicationName = ApplicationName _
			})

			' Define parameters of request.
			Dim listRequest As FilesResource.ListRequest = service.Files.List()
			listRequest.PageSize = 10
			listRequest.Fields = "nextPageToken, files(id, name)"

			' List files.
			Dim files As IList(Of Google.Apis.Drive.v3.Data.File) = listRequest.Execute().Files
			Console.WriteLine("Files:")
			If files IsNot Nothing AndAlso files.Count > 0 Then
				For Each file As var In files
					Console.WriteLine("{0} ({1})", file.Name, file.Id)
				Next
			Else
				Console.WriteLine("No files found.")
			End If
			Console.Read()

		End Sub
	End Class
End Namespace