using System;
using System.Net;
using System.Net.Security;
using System.Net.Sockets;
using System.Security;
using System.Security.Cryptography;
using System.Security.Cryptography.X509Certificates;

namespace UnsafeTransferProtocol
{

  public class TransferProtocolUsage
  {
    public void UnsafeTransferProtocol(TcpClient client,
                                       string targetHost,
                                       X509CertificateCollection clientCertificates,
                                       bool checkCertificateRevocation,
                                       AsyncCallback asyncCallback,
                                       object asyncState) {
       SslStream sslStream = new SslStream(client.GetStream(), false);
       sslStream.BeginAuthenticateAsClient(targetHost,
                                           clientCertificates,
                                           System.Security.Authentication.SslProtocols.Ssl2,
                                           checkCertificateRevocation,
                                           asyncCallback,
                                           asyncState);                   // "Deprecated Transfer Protocol (C#)" warning issued here 
       ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3;  // "Deprecated Transfer Protocol (C#)" warning issued here 
    }
  }
}