Ext.Net.PropertyGrid.RaiseCallBackEvent C# (CSharp) Method

        private void RaiseCallBackEvent(string eventArgument)
        {
            Response response = new Response(true, null);

            try
            {
                if (eventArgument.IsEmpty())
                {
                    throw new ArgumentNullException("eventArgument");
                }

                XmlNode xmlData = this.SubmitConfig;

                if (xmlData == null)
                {
                    return; 
                }

                XmlNode parametersNode = xmlData.SelectSingleNode("config/extraParams");

                string data = null;
                XmlNode serviceNode = xmlData.SelectSingleNode("config/serviceParams");

                if (serviceNode != null)
                {
                    data = serviceNode.InnerText;
                }

                string action = eventArgument;

                switch (action)
                {
                    case "update":
                        if (data == null)
                        {
                            throw new InvalidOperationException("No data in request");
                        }

                        this.BuildSource(data);

                        if (raiseChanged)
                        {
                            this.OnDataChanged(EventArgs.Empty);
                            raiseChanged = false;
                        }

                        break;
                }
            }
            catch (Exception ex)
            {
                response.Success = false;
                response.Message = this.IsDebugging ? ex.ToString() : ex.Message;
            }

            ResourceManager.ServiceResponse = response;
        }