public static void Run()
        {
            try
            {
                GoogleTestUser User2 = new GoogleTestUser("user", "email address", "password", "clientId", "client secret");
                string         accessToken;
                string         refreshToken;
                GoogleOAuthHelper.GetAccessToken(User2, out accessToken, out refreshToken);

                // Get IGmailclient
                using (IGmailClient client = GmailClient.GetInstance(accessToken, User2.EMail))
                {
                    Contact[] contacts = client.GetAllContacts();
                    Contact   contact  = contacts[0];

                    // ExStart:DeleteGmailContact
                    client.DeleteContact(contact.Id.GoogleId);
                    // ExEnd:DeleteGmailContact
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }