I need to get all message in all subfolders in my inbox not only exist in my inbox folder

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C#

In This Code i could to see all messages and to specify only the unread messages but my problem it show me only messages in my inbox folder main folder all sub folders are excluded

private void GetUnreadEmails4()
        {

            OutLook.Application myApp;
            myApp =new OutLook.Application();
            NameSpace mapiNameSpace = myApp.GetNamespace("MAPI");

            
            MAPIFolder myInbox = mapiNameSpace.GetDefaultFolder(Outlook.OlDefaultFolders.olFolderInbox);

            Items oItems = myInbox.Items.Restrict("[UnRead] = true");
            //Items oItems = myInbox.Items.Restrict("[UnRead] = true");
            MessageBox.Show(oItems.Count.ToString());

            foreach (dynamic item in oItems)
            {
                try
                {
                    var oMsg = (MailItem)item;
                    listBox1.Items.Add(oMsg.Subject.ToString());
                }
                
                catch (System.Exception)

                {
                    

                }

            }
        }

What I have tried:

MAPIFolder myInbox = mapiNameSpace.GetDefaultFolder(Outlook.OlDefaultFolders.olFolderInbox);

I know the problem is here but no idea please help