problem dll ATL & webservice

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C++

C#

in the ATL dll project there is one function with BYTE* Parameter.

STDMETHODIMP CMSDllServer::sum22(BYTE* aa,SHORT len)
{
	AFX_MANAGE_STATE(AfxGetStaticModuleState());

	
	for(int i=1;i<len;i++)
	{
		aa[i]=i;
	}
  return S_OK;
}

when call this function in a C# windows application this work correctly and array values returned to truth

byte[] Packet = new byte[5];

	dllServer.sum22(ref Packet[0],5);

       //out put
         1,2,3,4,5

but

the same function in a webservice returned to only first index array and exist very big problem

 byte[] Packet = new byte[5];
dllServer.sum22(ref Packet[0],5);

   //out put
     1,0,0,0,0

help me pleaseeeeeeeeeeeeeeeeeeeeeeeeeeeee

thanx