ClientContext with PreAuthenticate

static void Main(string[] args)
{
    ClientContext context = new ClientContext("https://sharepoint/sites/test1");
    context.ExecutingWebRequest += context_ExecutingWebRequest;
    var web = context.Web;
    context.Load(web);
    context.ExecuteQuery();
    Console.WriteLine("Title: " + web.Title);
}

static void context_ExecutingWebRequest(object sender, WebRequestEventArgs e)
{
    e.WebRequestExecutor.WebRequest.PreAuthenticate = true;
}