Inheritance: System.EventArgs
        private void LoginButtonClicked(object sender, EventArgs e)
        { 
            // Get the values entered in the text fields
            var username = UsernameEntry.Text;
            var password = PasswordEntry.Text;
            var domain = DomainEntry.Text;

            // Make sure the user entered all values
            if (string.IsNullOrEmpty(username) ||
                string.IsNullOrEmpty(password) ||
                string.IsNullOrEmpty(domain))
            {
                DisplayAlert("Login", "Please enter a username, password, and domain","OK");
                return;
            }

            // Fire the OnLoginInfoEntered event and provide the login values
            if (OnLoginInfoEntered != null)
            {
                // Create a new LoginEventArgs to contain the user's values
                var loginEventArgs = new LoginEventArgs(username.Trim(), password.Trim(), domain.Trim());

                // Raise the event
                OnLoginInfoEntered(sender, loginEventArgs);
            }
        }
        // Handle the OnLoginEntered event from the login UI
        // LoginEventArgs contains the username, password, and domain that were entered
        private void LoginInfoEntered(object sender, LoginEventArgs e)
        {
            // Make sure the task completion source has all the information needed
            if (_loginTaskCompletionSrc == null ||
                _loginTaskCompletionSrc.Task == null ||
                _loginTaskCompletionSrc.Task.AsyncState == null)
            {
                return;
            }

            try
            {
                // Get the associated CredentialRequestInfo (will need the URI of the service being accessed)
                CredentialRequestInfo requestInfo = _loginTaskCompletionSrc.Task.AsyncState as CredentialRequestInfo;

                // Create a new network credential using the values entered by the user
                var netCred = new System.Net.NetworkCredential(e.Username, e.Password, e.Domain);

                // Create a new ArcGIS network credential to hold the network credential and service URI
                var arcgisCred = new ArcGISNetworkCredential
                {
                    Credentials = netCred,
                    ServiceUri = requestInfo.ServiceUri
                };

                // Set the task completion source result with the ArcGIS network credential
                // AuthenticationManager is waiting for this result and will add it to its Credentials collection
                _loginTaskCompletionSrc.TrySetResult(arcgisCred);
            }
            catch (Exception ex)
            {
                // Unable to create credential, set the exception on the task completion source
                _loginTaskCompletionSrc.TrySetException(ex);
            }
            finally
            {
                // Dismiss the login controls
                Navigation.PopToRootAsync();
            }
        }