Sharepoint/Azure

using Microsoft.Graph;
using Microsoft.Identity.Client;
using System;
using System.IO;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WinFormsApp2
{
    public partial class Form1 : Form
    {
        private static string clientId = "YOUR_CLIENT_ID";
        private static string tenantId = "YOUR_TENANT_ID";
        private static string clientSecret = "YOUR_CLIENT_SECRET";
        private static string siteId = "YOUR_SITE_ID";
        private static string driveId = "YOUR_DRIVE_ID";

        public Form1()
        {
            InitializeComponent();
        }

        private async void UploadButton_Click(object sender, EventArgs e)
        {
            var filePath = "path_to_your_file";
            await UploadFileToSharePoint(filePath);
        }

        private async Task UploadFileToSharePoint(string filePath)
        {
            var confidentialClientApplication = ConfidentialClientApplicationBuilder
                .Create(clientId)
                .WithTenantId(tenantId)
                .WithClientSecret(clientSecret)
                .Build();

            var authProvider = new ClientCredentialProvider(confidentialClientApplication);

            var graphClient = new GraphServiceClient(authProvider);

            using (var fileStream = new FileStream(filePath, FileMode.Open))
            {
                var uploadSession = await graphClient
                    .Sites[siteId]
                    .Drives[driveId]
                    .Root
                    .ItemWithPath(Path.GetFileName(filePath))
                    .CreateUploadSession()
                    .Request()
                    .PostAsync();

                var maxChunkSize = 320 * 1024; // 320 KB
                var provider = new ChunkedUploadProvider(uploadSession, graphClient, fileStream, maxChunkSize);

                var uploadResult = await provider.UploadAsync();

                if (uploadResult.UploadSucceeded)
                {
                    MessageBox.Show("File uploaded successfully!");
                }
                else
                {
                    MessageBox.Show("File upload failed.");
                }
            }
        }
    }
}