using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Security;
using System.Text;
using System.Threading.Tasks;
using Microsoft.SharePoint.Client;

namespace CSOMconnectSPO
{
    class Program
    {
        static void Main(string[] args)
        {
            string userName = "amos@contoso.onmicrosoft.com";
            Console.WriteLine("Enter your password.");
            SecureString password = GetPassword();
            // ClienContext - Get the context for the SharePoint Online Site  
            // SharePoint site URL - https://c986.sharepoint.com  
            using (var clientContext = new ClientContext("https://contoso.sharepoint.com/sites/dev"))
            {
                // SharePoint Online Credentials  
                clientContext.Credentials = new SharePointOnlineCredentials(userName, password);
                // Get the SharePoint web  
                Web web = clientContext.Web;
                // Load the Web properties  
                clientContext.Load(web);
                // Execute the query to the server.  
                clientContext.ExecuteQuery();
                // Web properties - Display the Title and URL for the web  
                Console.WriteLine("Title: " + web.Title + "; URL: " + web.Url);
                Console.ReadLine();
            }
        }
        private static SecureString GetPassword()
        {
            ConsoleKeyInfo info;
            //Get the user's password as a SecureString  
            SecureString securePassword = new SecureString();
            do
            {
                info = Console.ReadKey(true);
                if (info.Key != ConsoleKey.Enter)
                {
                    securePassword.AppendChar(info.KeyChar);
                }
            }
            while (info.Key != ConsoleKey.Enter);
            return securePassword;
        }

    }
}