/// <summary><para>Returns an <see cref="IEnumerable{T}"/> of <see cref="DataColumn"/> values that represents <paramref name="collection"/>.</para></summary>
/// <param name="collection"><para>The target of the extension method.</para></param>
/// <returns><para><see cref="IEnumerable{T}"/> of <see cref="DataColumn"/> values or <see cref="Enumerable.Empty{TResult}"/>.</para></returns>
public static IEnumerable <DataColumn> Select(this DataColumnCollection collection) =>
collection.Select(dc => dc);