How do I delete an element from an array

I have 2 arrays, FileList1 and FileList2. As I compare the 2, I want to delete any entries in FileList1 that are also in FileList2.

I found an answer at https://www.experts-exchange.com/questions/23721653/Compare-arrays-of-different-sizes.html but I get the error "RemoveAt is not a member of System.Array"

It seems to have worked for a previous questioner so why not for me?

I am using Visual Studio Express 2008, (Visual Basic).

Dim FileList1(count1) As String ' Count1 is determined by some previous code
            Dim FileList2(count2) As String ' Count2 is determined by some previous code
 
            ' Code to populate the arrays
 
           If FileList1.Count > FileList2.Count Then
                For i As Integer = FileList1.Count - 1 To 0 Step -1
                    For x As Integer = FileList2.Count - 1 To 0 Step -1
                        If FileList2(x).ToString = FileList1(i).ToString Then
                            FileList1.RemoveAt(i)
                            Exit For 
                        End If
                    Next
                Next
            End If

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