HELP c# How to deteming the real ToolStripItem type

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C#

.NET

I am converting a VB.Net application to C#. Everything else is going great. Except this bit. I have a function which builds menus,sub menus and seperators from a database. It can build a MenuStrip or a ContextMenuStrip which can then be assigned to a form.
This means that menus can be extensive and conpmex but managed outside the application, which I also use as part of my security access model. All menus are controlled from the database externally, it also means I can develop visual tools (Treeviews etc) to manage user menus. The application uses menus extensively which is by design.
Programmatically I want to assign an eventhandler to every item that isnt a dropdown or a seperator
In VB I would do this, (works perfectly)

Private Sub AddHandlers (ByVal voMenuItems As ToolStripItemCollection)
    For Each oItem in voMenuItems
        If TypeOf(oItem is ToolStripDropDown) then
            if oItem.DropDownItems.Count > 0 then
                AddHandlers(oItem.DropDownItems)
            Else
                AddHandler oItem.Click, AddressOf ToolBarButtonClick
            End If
        End If
    Next
End Sub
Private Sub ToolbarButtonClick(ByVal sender As System.Object, ByVal e As System.EventArgs)
    'Do something
End Sub

but how would I achieve the same in C#
I have to code my loop like this

foreach (ToolStripItem oItem in voMenuItems)

Which always returns a ToolStripItem (using either, GetType or typeof), I cannot find any way to determine the type of item (ToolStripDropDown or ToolStripSeperator) that the ToolStripItem actually is, and even then I can't cast to the type that I want e.g.

(ToolStripDropDown)oItem.DropDownItems.Count ...

This gives a compile time error
"System.Windows.Forms.ToolStripItem' does not contain a definition for 'DropDownItems' and no extension method 'DropDownItems' accepting a first argument of type 'System.Windows.Forms.ToolStripItem' could be found (are you missing a using directive or an assembly reference?)"

What I want to do is this

void AddMenuHandlers(ToolStripItemCollection voMenuItems)
{
    //ToolStripItem oItem;

    foreach (ToolStripItem oItem in voMenuItems)
        if (oItem is ToolStripDropDown)
        {
            if (ToolStripDropDown)oItem.DropDownItems.Count > 0)
            {
                AddMenuHandlers((ToolStripDropDown)oItem.DropDownItems);
            }
            else
            {
                oItem.Click += new EventHandler(moMenu_Click);
            }
        }
}