Navigate in outlook Inbox sub folders

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C#3.0

C#

Outlook

hi i wrote following code for get name of outlook inbox subfolders to combo box

public void LoadEmailFolderCombo(ToolStripComboBox nbFolder)
      {
          OutLook._Application outlookObj = new OutLook.Application();
          OutLook.MAPIFolder emailFolder = (OutLook.MAPIFolder)
           outlookObj.Session.GetDefaultFolder(OutLook.OlDefaultFolders.olFolderInbox);

          if (!nbFolder.Items.Contains("Default"))
          {
              nbFolder.Items.Add("Default");
          }
          foreach (OutLook.MAPIFolder subFolder in emailFolder.Folders)
          {
              if (!nbFolder.Items.Contains(subFolder.Name))
              {
                  nbFolder.Items.Add(subFolder.Name);
              }
          }
      }

but there is a problem it takes only names of folders inside the inbox folder but wont take names of folders in side the subfolders as example think that i have 1 subfolder kasun inside the inbox and inside kasun i have kasunmit it takes only kasun not kasunmit pls tell wht i am trying to is correct or is there any new way to do it
thank you