Convert Database Linq Query Results to String List - vb.net

Question

I am trying to use a LINQ query to grab some data from a database, and since I am grabbing just one column of data I want to store it within a string list. This is the code I have.
Dim POList As New List(Of String)
Using dbContext As New DBLINQDataContext
Dim query = (From o In dbContext.Orders
Where o.Order_Number.StartsWith(JobNumber)
Select o.Order_Number)
POList = query.ToList()
End Using
MessageBox.Show(POList.ToString())
When I run this the data in the MessageBox is
System.Collections.Generic.List`1[System.String]
There is no table data, even though I know there are actual data points for me to be getting :\

Answer 1

POList.ToString() will display the name of the object type.
You can use string.Join(",", POList.ToString()).
You can also define an extension method StringJoin() to show your list as string if you are going to use it frequently.
Here is an extension method that you can use:
public static StringExtensions
{
public static string StringJoin(this IEnumerable<string> strings, string seperator)
{
if (strings == null) return null;
return string.Join(seperator, strings);
}
}

Answer 2

Since this was a vb.net question, I translated #vendettamit 's excellent answer for the benifit of future vb readers.
Public Module StringExtensions
<Extension()>
Public Function StringJoin(MyStrings As IEnumerable(Of String), separator As String) As String
If MyStrings Is Nothing Then
Return Nothing
Else
Return String.Join(separator, MyStrings)
End If
End Function
End Module
To use the extension...
Dim l As New List(Of String) From {"Mathew", "Mark", "Luke", "John"}
Dim s As String = l.StringJoin(", ")
Debug.Print(s)