public ViewFamily GetViewFamily(Document doc, View view)
{
    ViewFamily viewFamily = ViewFamily.Invalid;

    ElementId viewTypeId = view.GetTypeId();
    if (viewTypeId.IntegerValue > 1) // some views may not have a ViewFamilyType
    {
        ViewFamilyType viewFamilyType = doc.GetElement(viewTypeId) as ViewFamilyType;
        viewFamily = viewFamilyType.ViewFamily;
    }

    return viewFamily;
}

Public Function GetViewFamily(doc As Document, view As View) As ViewFamily
    Dim viewFamily__1 As ViewFamily = ViewFamily.Invalid

    Dim viewTypeId As ElementId = view.GetTypeId()
    If viewTypeId.IntegerValue > 1 Then
        ' some views may not have a ViewFamilyType
        Dim viewFamilyType As ViewFamilyType = TryCast(doc.GetElement(viewTypeId), ViewFamilyType)
        viewFamily__1 = viewFamilyType.ViewFamily
    End If

    Return viewFamily__1
End Function