The CORBA box valuetype (TBD) ...... 

It maps to C#'s class type.

// CORBA IDL

module demo
{
   module obv
   {
      module valuebox
      {
         valuetype longBox long;
      };
   };
};

e.g.
longBox
longBoxHelper

// C#
					 
[Serializable]
public class longBox : Org.Omg.CORBA.Portable.ValueBase
{
   /**
   * Reference to the boxed value
   */
   public int value;

   /**
   * Constructor
   * 
   * @param initial the initial boxed value
   */
   public longBox(int initial)
   {
      value = initial;
   }

   //
   // Return value box id
   //
   private static string[] _ids = { longBoxHelper.Id() };

   /**
   * Return truncatable ids
   */
   public string[] _Truncatable_Ids()
   {
      return _ids;
   }
}

public class longBoxHelper : Org.Omg.CORBA.Portable.BoxedValueHelper 
{ 
   ///
   /// Insert longBox into an any
   /// @param a an any
   /// @param t longBox value 
   ///
   public static void Insert(Org.Omg.CORBA.Any a, demo.obv.valuebox.longBox t )
   { 
      a.Insert_Value(t, Type()); 
   }
   
   ///
   /// Extract longBox from an any 
   /// @param a an any 
   /// @return the extracted longBox value 
   /// 
   public static demo.obv.valuebox.longBox Extract(Org.Omg.CORBA.Any a)
   {
      if (!a.Type().Equal(Type())) 
         throw new Org.Omg.CORBA.MARSHAL(); 
      try 
      { 
         return (demo.obv.valuebox.longBox)a.Extract_Value(); 
      }
      catch (System.InvalidCastException e) 
      {
         throw new Org.Omg.CORBA.MARSHAL(e.Message);
      }
   } 
      
   ///
   /// Internal TypeCode value
   /// 
   private static Org.Omg.CORBA.TypeCode _tc = null;
   
   ///
   /// Return the longBox TypeCode
   /// @return a TypeCode 
   ///
   public static Org.Omg.CORBA.TypeCode Type() 
   {
      if (_tc == null)
      { 
         Org.Omg.CORBA.ORB orb = Org.Omg.CORBA.ORB.Init();
         _tc = orb.Create_Value_Box_TC(Id(),
                 "longBox",orb.Get_Primitive_TC(Org.Omg.CORBA.TCKind.tk_long)); 
      }
      return _tc; 
   } 
      
   ///
   /// Return the longBox IDL ID
   /// @return an ID 
   /// 
   public static string Id()
   { 
      return _id;
   }
      
   private static string _id = "IDL:demo/obv/valuebox/longBox:1.0"; 
   
   ///
   /// Read longBox from a marshalled stream 
   /// @param istream the input stream
   /// @return the readed longBox value 
   /// 
   public static demo.obv.valuebox.longBox Read(
            Org.Omg.CORBA.Portable.InputStream istream)
   {
      return (demo.obv.valuebox.longBox) ((Org.Omg.CORBA_2_3.Portable.InputStream)
               istream).Read_Value(new demo.obv.valuebox.longBoxHelper());
   }

   ///
   /// Write longBox into a marshalled stream
   /// @param ostream the output stream
   /// @param value longBox value
   ///
   public static void Write(Org.Omg.CORBA.Portable.OutputStream ostream, demo.obv.valuebox.longBox value)
   {
      ((Org.Omg.CORBA_2_3.Portable.OutputStream) ostream).Write_Value(
			value, new demo.obv.valuebox.longBoxHelper());
   }

   ///
   /// Read a value from an input stream
   ///
   public System.Object Read_Value(Org.Omg.CORBA.Portable.InputStream _is)
   {
      demo.obv.valuebox.longBox _box = new demo.obv.valuebox.longBox((int)0);
      _box.value = _is.Read_Long();
      return _box;
   }

   ///
   /// Write a value into an output stream
   ///
   public void Write_Value(Org.Omg.CORBA.Portable.OutputStream os, System.Object value)
   {
      longBox _box = (longBox)value;
      os.Write_Long(_box.value);
   }

   ///
   /// Return the value id
   ///
   public string Get_Id()
   {
      return Id();
   }
}