private void mBtnSignIn_Click(object sender, EventArgs e)
 {
     if (mTxtMail.Text == "")
     {
         mtxtMistake.Text = "Geben Sie Ihre E-Mail ein";
     }
     else
     {
         if (mTxtPassword.Text == "")
         {
             mtxtMistake.Text = "Geben Sie Ihr Passwort ein";
         }
         else
         {
             rClient.endPoint = "http://h2793624.stratoserver.net/php_rest/api/post/read_user_single.php?Mail=" + mTxtMail.Text;
             string response = string.Empty;
             response = rClient.makeRequest();
             NutzerModel.readSingleUser(response);
             if (mTxtPassword.Text.Equals(NutzerModel.Passwort))
             {
                 Console.WriteLine("Erfolgreich");
                 //Intent contacts = new Intent(this, typeof(Contacts));
                 //StartActivity(contacts);
             }
             else
             {
                 mtxtMistake.Text = "E-Mail oder Passwort falsch";
             }
         }
     }
 }
        private void signUpDialog_mOnSignUpComplete(object sender, OnSignUpEventArgs e)
        {
            rClient.endPoint = "http://h2793624.stratoserver.net/php_rest/api/post/read_user_single.php?Mail=" + e.EMail;
            string response = string.Empty;

            response = rClient.makeRequest();
            NutzerModel.readSingleUser(response);
        }