C# Remoting fails to add a row to a DataSet - "Object reference not set to an instance of an object"

Hi People,

I've got a project using remoting and an ado.net dataset. As follows:

A service:

namespace myService
{
    public partial class ScheduleService : ServiceBase

A class library:

namespace RemotingObject
{
    public class ScheduleObject : MarshalByRefObject

A console application:

namespace TinyConsole
{
    public class ScheduleClient


The service runs a routine "Init()" using remoting in the class library, which fills a DataSet with the contents of an XML file.

I have a routine addProcess in the class library which when passed a bunch of parameters creates a new row in a DataSet as follows:

        public bool addProcess(string name, string exe, string schedule, string repeat, int interval)
        {
            if ((name != "") && (exe != "") && (schedule != ""))
            {
                DataRow newProcess = ds.Tables["task"].NewRow();

                newProcess["name"] = name;
                newProcess["exe"] = exe;
                newProcess["schedule"] = schedule;
                newProcess["repeat"] = repeat;
                newProcess["interval"] = interval;
                ds.Tables["task"].Rows.Add(newProcess);

                StreamWriter sWrite = new StreamWriter(strCfgFile);
                XmlTextWriter xWrite = new XmlTextWriter(sWrite);
                ds.WriteXml(xWrite, XmlWriteMode.WriteSchema);
                xWrite.Close();

                return true;
            }
            else
            {
                return false;
            }
        }

When I call this from my within the class library it runs fine, however if if I try to run it from the console application as follows:

TcpChannel chan = new TcpChannel();
ChannelServices.RegisterChannel(chan, true);
RemotingObject.ScheduleObject obj = (RemotingObject.ScheduleObject)Activator.GetObject(typeof(RemotingObject.ScheduleObject), "tcp://localhost:1337/myService");

bool res = obj.addProcess(strName, strExe, strSchedule, strRepeat, intInterval);

I get the following error:

"Object reference not set to an instance of an object"

However I can call other routines fine, e.g I have one that tells me the number of items in the dataset as follows that works ok:

numberOfObjects = obj.GetNumberOfObjects();

If I do addProcess(strName, strExe, strSchedule, strRepeat, intInterval); from within the calss library itsself it works fine.

Can anyone see what I'm doing wrong here?Start Free Trial