Private Sub Form_Load()
    Dim objApp As SolidEdgeframework.Application
    Dim objDoc As SolidEdgepart.PartDocument
    Dim objBody As solidedgegeometry.Body
    Dim objShell As solidedgegeometry.Shell
    Dim bIsVoid As Boolean
    Const TESTFILE = "T:\vbtests\testcases\freeform.par"
    ' Report errors
    Const PI = 3.14159265358979
    ' Create/get the application with specific settings
    On Error Resume Next
    Set objApp = GetObject(, "SolidEdge.Application")
    If Err Then
        Err.Clear
        Set objApp = CreateObject("SolidEdge.Application")
        Set objDoc = objApp.Documents.Add("SolidEdge.PartDocument")
        objApp.Visible = True
    Else
        Set objDoc = objApp.ActiveDocument
    End If
    Call objDoc.Close
    ' opening the test case file
    Set objDoc = objApp.Documents.Open(TESTFILE)
    ' getting the body object of the extruded protrusion feature
    Set objBody = objDoc.Models(1).Body
    ' getting a particular shell from the collection of shells on the body object
    Set objShell = objBody.Shells.Item(1)
    ' checking whether the shell is void or not
    bIsVoid = objShell.IsVoid
    ' USER DISPLAY
    ' Release objects
    Set objApp = Nothing
    Set objDoc = Nothing
    Set objBody = Nothing
    Set objShell = Nothing
End Sub