If you wanted to add the ability to do this as an extension method, here's a method called `DistinctBy` which takes in the source and keySelector as parameters and returns the distinct item set. It does the same thing as Ahmad's second query, but looks a little prettier inline.

####**C#**:



    public static IEnumerable<TSource> DistinctBy<TSource, TKey>(
                                    this IEnumerable<TSource> source, 
                                    Func<TSource, TKey> keySelector)
    {
    	return source.GroupBy(keySelector).Select(i => i.First());
    }

####**VB**:



    <Extension()>
    Public Function DistinctBy(Of TSource, TKey)(
                        ByVal source As IEnumerable(Of TSource),
                        ByVal keySelector As Func(Of TSource, TKey))
                        As IEnumerable(Of TSource)

        Return source.GroupBy(keySelector).Select(Function(i) i.First())
    End Function

Then call like this:



    var s = (from p in operatorList.DistinctBy(x => x.ID)                       
             select p.ID, p.Name, p.Phone)

Given:

    var s = (from p in operatorList                       
        select p.ID, p.Name,p.Phone)

How would I return the Distinct records based only on the ID?
