/// <summary>
/// Returns distinct elements from a sequence by using the default equality comparer to compare values.
/// </summary>
/// <typeparam name="TSource">The type of the elements of <paramref name="source"/>.</typeparam>
/// <param name="source">The sequence to remove duplicate elements from.</param>
/// <returns>
/// An <see cref="IBindableCollection{TElement}"/> that contains distinct elements from the source sequence.
/// </returns>
/// <exception cref="T:System.ArgumentNullException">
/// <paramref name="source"/> is null.</exception>
public static IBindableCollection <TSource> Distinct <TSource>(this IBindableCollection <TSource> source) where TSource : class
{
return(source.Distinct(null));
}