private void RemoveCommandsAndCommandBars ( )
{
    // Get the commands collection.
    Commands Cmds = m_ApplicationObject.Commands ;
    
    // Look through each of the commands and delete the ones I 
    // add.  Keep in mind this is only going to run just the 
    // first time you load this add-in.  After that you have 
    // them.
    foreach ( Command CmdDel in Cmds )
    {
    if ( ( CmdDel.Name == ResConstant.StripTWSSaveFullCommand   )||
         ( CmdDel.Name == ResConstant.StripTWSSaveAllFullCommand)||
         ( CmdDel.Name == ResConstant.AutoSaveSetupFullCommand  )  )
    {
        try
        {
        CmdDel.Delete ( ) ;
        }
        catch ( System.Exception )
        {
        }
    }                                  
    }
}

private void DoInitialCommandSetup ( )
{
    try
    {
    
        // Get the commands collection.
        Commands Cmds = m_ApplicationObject.Commands ;
        // Get the command bars collection.
        _CommandBars CommandBars = 
               m_ApplicationObject.CommandBars ;

        // To make my development life easier, I'm going to 
        // assume that the commands might already have been 
        // added to this instance of Visual Studio.  Therefore, before I 
        // add them, I'll attempt to delete each one.  This way,
        // it will be much easier to continue to add commands 
        // from this add-in as I develop it.
        RemoveCommandsAndCommandBars ( ) ;

        // Allocate an empty context GUID array.
        object []ContextGUIDS = new object[] { } ;

        // Now I can add my commands.  Safely.  If anything 
        // throws here, it's something really serious!

        int DisFlags = (int)vsCommandStatus.vsCommandStatusSupported + 
                   (int)vsCommandStatus.vsCommandStatusEnabled ;

        Command Cmd = null ;
                            
        // Add the StripTrailingWhiteSpaceSave command.
        Cmd = 
        Cmds.AddNamedCommand ( m_AddInInstance            , 
                       ResConstant.StripTWSSave           ,
                       ResConstant.StripTWSSaveButtonText ,
                       ResConstant.StripTWSSaveToolTip    ,
                       false                              ,
                       ResConstant.StripTWSBitmapID       ,
                       ref ContextGUIDS                   ,   
                       DisFlags                            ) ;
        
        // Add the StripTrailingWhiteSpaceSaveAll command.
        Cmd = 
        Cmds.AddNamedCommand ( m_AddInInstance             , 
                       ResConstant.StripTWSSaveAll         ,
                       ResConstant.StripTWSSaveAllButtonText,
                       ResConstant.StripTWSSaveAllToolTip  ,
                       false                               ,
                       ResConstant.StripTWSAllBitmapID     ,
                       ref ContextGUIDS                    ,
                       DisFlags                             ) ;   
        
        // Add the AutoSaveSetup command.
        Cmd =
            Cmds.AddNamedCommand ( m_AddInInstance      , 
                       ResConstant.AutoSaveSetup        ,
                       ResConstant.AutoSaveSetupButtonText,
                       ResConstant.AutoSaveSetupToolTip ,
                       false                            ,
                       ResConstant.AutoSaveSetupBitmapID,
                       ref ContextGUIDS                 ,   
                       DisFlags                          ) ;   

    }
    catch ( System.Exception eEx ) 
    {
        MessageBox.Show ( eEx.Message + "\r\n" + 
                          eEx.StackTrace.ToString ( ) ,
                             "Exception in DoInitialCommandSetup" ) ;
    }                
}