VSTO & Excel vlookup question

I'm trying to use the vlookup function in VB.net, and I can't get it to work. In vba, this was simple, but I can't figure out how to call this function in VSTO. I think the problem is with the microsoft.office.interop.excel part. Help on this would be great, I'm struggling with pulling functionality from Excel into VSTO and .net. Thanks!

Private Function myLookup(ByVal value As String, ByVal aRange As Excel.Range, ByVal index As Integer, ByVal notexact As Boolean) As String

On Error GoTo ErrorHandler

myLookup = Microsoft.Office.Interop.Excel.WorksheetFunction.VLookup(value, aRange, index, notexact)

If (IsError(myLookup) Or (Err.Number <> 0)) Then
myLookup = ""
End If
Exit Function
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