public View CreateDependentCopy(View view)
{
    View dependentView = null;
    ElementId newViewId = ElementId.InvalidElementId;
    if (view.CanViewBeDuplicated(ViewDuplicateOption.AsDependent))
    {
        newViewId = view.Duplicate(ViewDuplicateOption.AsDependent);
        dependentView = view.Document.GetElement(newViewId) as View;
        if (null != dependentView)
        {
            if (dependentView.GetPrimaryViewId() == view.Id)
            {
                TaskDialog.Show("Dependent View", "Dependent view created successfully!");
            }
        }
    }

    return dependentView;
}

Public Function CreateDependentCopy(view As View) As View
    Dim dependentView As View = Nothing
    Dim newViewId As ElementId = ElementId.InvalidElementId
    If view.CanViewBeDuplicated(ViewDuplicateOption.AsDependent) Then
        newViewId = view.Duplicate(ViewDuplicateOption.AsDependent)
        dependentView = TryCast(view.Document.GetElement(newViewId), View)
        If dependentView IsNot Nothing Then
            If dependentView.GetPrimaryViewId() = view.Id Then
                TaskDialog.Show("Dependent View", "Dependent view created successfully!")
            End If
        End If
    End If

    Return dependentView
End Function