Custom LINQ Operator?

public static class LinqExtensions
{
public static IEnumerable<T> WhereNot<T>(this IEnumerable<T> source, Func<T,bool>

predicate)

{
foreach (var item in source)
if (!predicate(item))

yield return item;

}
}

Usage

var employees = list.WhereNot(e => e.IsDeleted);