public override void Marshal(DataOutputStream dos)
        {
            base.Marshal(dos);
            if (dos != null)
            {
                try
                {
                    this._orginatingEntityID.Marshal(dos);
                    this._recevingEntityID.Marshal(dos);
                    dos.WriteUnsignedInt((uint)this._requestID);
                    dos.WriteUnsignedByte((byte)this._requiredReliabilityService);
                    dos.WriteUnsignedByte((byte)this._tranferType);
                    this._transferEntityID.Marshal(dos);
                    dos.WriteUnsignedByte((byte)this._recordSets.Count);

                    for (int idx = 0; idx < this._recordSets.Count; idx++)
                    {
                        RecordSet aRecordSet = (RecordSet)this._recordSets[idx];
                        aRecordSet.Marshal(dos);
                    }
                }
                catch (Exception e)
                {
                    if (PduBase.TraceExceptions)
                    {
                        Trace.WriteLine(e);
                        Trace.Flush();
                    }

                    this.RaiseExceptionOccured(e);

                    if (PduBase.ThrowExceptions)
                    {
                        throw e;
                    }
                }
            }
        }