I've added teh following Extensions to my Project in order to create a thread safe list:

Extensions If I want to conduct a simple operation on my list

   <Extension()> _
    Public Sub Action(Of T)(ByVal list As List(Of T), ByVal action As Action(Of List(Of T)))
        SyncLock (list)
            action(list)
        End SyncLock
    End Sub

If I want to pass it more than one parameter I could simply extend it with more items...

<Extension()> _
Public Sub Action(Of T)(ByVal list As List(Of T), ByVal action As Action(Of List(Of T), T), ByVal item As T)
    SyncLock (list)
        Action(list, item)
    End SyncLock
End Sub

Actions I have created the following Action Examples:

Private Sub Read(Of T)(ByVal list As List(Of T))
    Console.WriteLine("Read")
    For Each item As T In list
        Console.WriteLine(item.ToString)
        Thread.Sleep(10)
    Next
End Sub

and also one that takes a parameter:

Private Sub Write(Of T)(ByVal list As List(Of T), ByVal item As T)
    Thread.Sleep(100)
    list.Add(item)
    Console.WriteLine("Write")
End Sub

Initiating Then in my various threads I will call my Actions with:

list.Action(AddressOf Read)

or

list.Action(AddressOf Write2, 10)

Are these Extenxion methods thread safe or do you have other recommendations?