/// <summary>
/// Delete the user's account in a background task.
/// </summary>
/// <param name="password">the current password of the account.</param>
/// <returns></returns>
private OperationReturnMessage DeleteAccount(string password)
{
Device.BeginInvokeOnMainThread(() => this.LabelDeleteAccountMessage.Text = "Waiting...");
return(ServerOperations.DeleteAccount(CredentialManager.Username, password.Trim()));
}