/// <summary>
/// Attempt to read and set stored settings upon application load
/// </summary>
protected override void OnStart()
{
// Handle when your app starts
// ReadSettingsFromFile() returns null if successful
string errorMessage = AppFunctions.ReadSettingsFromFile();
if (!String.IsNullOrEmpty(errorMessage))
{
// Display error
Application.Current.MainPage.DisplayAlert("Test Mate", errorMessage, "OK");
// Disable application only if the error is NOT a missing settings file (e.g., IOException, etc.)
App.enableAppFlag = (errorMessage != AppResources.SettingsMissingErrorMessage) ? false : true;
}
}