IEditor接口求助

IApplication pApp;<BR>   IEditor pEditor;<BR>  <FONT color=#ff3300> pApp = new AppRefClass();</FONT><BR>   pEditor = (IEditor)pApp.FindExtensionByName("ESRI Object Editor");<BR>红色这句话有灾难性的错误。请问在C#中得到给Ieditor接口赋值

<P>下面是帮助里的例子，你的错误是什么？</P>
<P>In VBA, the Application object is globally available. <BR></P><PRE><CODE>  Dim pEditor As IEditor
  Dim pID As New UID

  pID = "esriEditor.Editor"
  Set pEditor = Application.FindExtensionByCLSID(pID)
</CODE></PRE>
<P><BR>With Visual Basic you are working outside of the application and you therefore need to establish a hook to it. When implementing<B> ICommand</B> to create a command or tool, a hook to the application is passed to <B>OnCreate</B> </P><PRE><CODE> Private m_pApp as IApplication
 Private m_pEditor as IEditor

 Private Sub ICommand_OnCreate(ByVal hook As Object)
   Dim pID As New UID

   pID = "esriEditor.Editor"
   Set m_pApp = hook
   Set m_pEditor = m_pApp.FindExtensionByCLSID(pID)
 End Sub
</CODE></PRE>

hook我们在C#中怎么得到啊

<P>其实我最大的问题还是在C#中怎么给m_pApp赋值</P>

<P>我怎么样把他翻译为C#的</P>