No repetition of values in list (C#)

Question

I created a favorite list box where the user can save text from Textblock in MainPage.xaml

Answer 1

You can check for duplicates quite easily using a LINQ Any query at the beginning of the FavoriteButton_Click method:

private void FavoriteButton_Click( object sender, RoutedEventArgs e )
{
    //check if there is any item with the same text
    //in which case do not continue
    if ( listobj.Any( l => l.AnswerName == AnswerTextBlock.Text ) ) return;

    listobj.Add( new MyData { AnswerName = AnswerTextBlock.Text } );


    using ( IsolatedStorageFileStream fileStream = Settings1.OpenFile( "MyStoreItems", FileMode.Create ) )
    {
        DataContractSerializer serializer = new DataContractSerializer( typeof( MyDataList ) );
        serializer.WriteObject( fileStream, listobj );

    }
}