C#

private void InternalStartup()
        {
            this.Application.ItemContextMenuDisplay +=new Microsoft.Office.Interop.Outlook.ApplicationEvents_11_ItemContextMenuDisplayEventHandler(Application_ItemContextMenuDisplay);
            this.Application.ContextMenuClose +=new Microsoft.Office.Interop.Outlook.ApplicationEvents_11_ContextMenuCloseEventHandler(Application_ContextMenuClose);
            this.Application.ActiveExplorer().SelectionChange += new Microsoft.Office.Interop.Outlook.ExplorerEvents_10_SelectionChangeEventHandler(ThisAddIn_SelectionChange);
            this.Startup += new System.EventHandler(ThisAddIn_Startup);            
            this.Shutdown += new System.EventHandler(ThisAddIn_Shutdown);
        }



void ThisAddIn_SelectionChange()
        {
            if (btnManualFiling != null)
            {
                if (this.Application.ActiveExplorer().Selection.Count > 0)
                {

                    btnManualFiling.Enabled = true;                    

                }
                else
                {
                    btnManualFiling.Enabled = false;                    
                }
                CurrentSelection = this.Application.ActiveExplorer().Selection.Count.ToString();
                btnManualFiling.Caption = TomaxManCaption + "(" + CurrentSelection + " items)";
            }
        }

private void ThisAddIn_Startup(object sender, System.EventArgs e)
        {
                        AddMenuBar();
         }

private void buttonOne_Click(Office.CommandBarButton ctrl, ref bool cancel)
        {            
            frmManualFiling wnd = new frmManualFiling(this.Application);
            wnd.ShowDialog();
            wnd.Dispose();
            wnd = null;
            
         }