Connect SharePoint using Azure App Application/Delegate Authentication in C#

1. Connect SharePoint using Azure App Application Authentication in C#
Create Azure app and give below Application permissions. 

using Azure.Identity;

using Microsoft.Graph;

public class Program

{

    public static async Task Main(string[] args)

    {

        string tenantId = "";

        string clientId = "";

        string clientSecret = "";

        string siteId = "283f598a-6b0f-4ba5-af06-c72a0cef8f42";

        string listId = "e9609d64-1f36-45a2-8260-743998ea2cd4";

        var credential = new ClientSecretCredential(tenantId, clientId, clientSecret);

        var graphClient = new GraphServiceClient(credential);

        var items = await graphClient.Sites[siteId].Lists[listId].Items.GetAsync();

        foreach (var item in items.Value)

        {

            Console.WriteLine($"Item ID: {item.Id}, Created By: {item.CreatedBy?.User?.DisplayName}");

        }

        Console.ReadKey();

    }

}

2. Connect SharePoint using Azure App Delegate Authentication in C#