Question

for (int i = 0; i < client.Folders.Count; i++)
        {

            (ContextMenuListView.Items[1] as ToolStripMenuItem).DropDownItems.Add(client.Folders[i].Name);//add Folder to Move To
            (ContextMenuListView.Items[2] as ToolStripMenuItem).DropDownItems.Add(client.Folders[i].Name);                
        }

how to I get subitem in Items[1] or Items[2] ?

Answer 1

ToolStripItemCollection.Add(string) (DropDownItems.Add()) will return the new ToolStripItem …

on the other hand, all other sub items are referenced by the ToolStripItemCollection DropDownItems

so the easy way to get the two created items is:

(ContextMenuListView.Items[1] as ToolStripMenuItem).DropDownItems.Add(client.Folders[i].Name);
(ContextMenuListView.Items[2] as ToolStripMenuItem).DropDownItems.Add(client.Folders[i].Name);

would become:

ToolStripItem firstItem = (ContextMenuListView.Items[1] as ToolStripMenuItem).DropDownItems.Add(client.Folders[i].Name);
ToolStripItem secondItem = (ContextMenuListView.Items[2] as ToolStripMenuItem).DropDownItems.Add(client.Folders[i].Name);

or to access all sub items:

foreach(ToolStripItem i in (ContextMenuListView.Items[1] as ToolStripMenuItem).DropDownItems.OfType<ToolStripItem>())
{
   //...
}

or to access a specific sub item:

var specificItem = (ContextMenuListView.Items[1] as ToolStripMenuItem).DropDownItems.Item[0];