How to loop through sub menu through menu items

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C#3.0

C#

Windows

application

form

I want to loop through all menu items and put the items to treeview. I used following code for this purpose.

inforamtion
I have Transaction Menu and it has a Purchase Menu and purchase menu have
(Purchase invoice, Good Receive Note, etc). I want to get this items to treeview, under transaction, should have purchase and under purchase should have purchase invoice and good receive note

How can I do this..?

Please help me.

Thanks

private void GetControlByName()     
{
    for (int i = 0; i < this.menuStrip1.Items.Count; i++)
    {
        string mnuItemName = this.menuStrip1.Items[i].Text;
        Tree.Nodes.Add("", mnuItemName, 0, 2);
        ToolStripMenuItem tmpMenuItem = this.menuStrip1.Items[i] as ToolStripMenuItem;
        
        for (int j = 0; j < tmpMenuItem.DropDownItems.Count; j++)
        {
            string menuSubItem = tmpMenuItem.DropDownItems[j].Text;
            if (menuSubItem != "")
            {
                Tree.Nodes[i].Nodes.Add("", menuSubItem, 1, 2);


            }
        }
    }
    Tree.ExpandAll();
}