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Update using Pre and Post image into one field and get data from two fields?

 Code  inside Execute Functions in C#:


            // Extract the tracing service for use in debugging sandboxed plug-ins.


            ITracingService tracingService =


            (ITracingService)serviceProvider.GetService(typeof(ITracingService));



            // Obtain the execution context from the service provider.


            IPluginExecutionContext context =


            (IPluginExecutionContext)serviceProvider.GetService(typeof(IPluginExecutionContext));



            // Obtain the organization service factory.


            IOrganizationServiceFactory serviceFactory =


            (IOrganizationServiceFactory)serviceProvider.GetService(typeof(IOrganizationServiceFactory));



            // Obtain the organization service.    

            IOrganizationService service = serviceFactory.CreateOrganizationService(context.UserId);



            if (context.InputParameters.Contains("Target") &&


                          context.InputParameters["Target"] is Entity)


            {


                // Obtain the target entity from the input parameters.


                Entity entity = (Entity)context.InputParameters["Target"];


                // User is updating only email address in lead form so we will get only 

               

        // get the lead email from context.


                string email = entity["emailaddress1"].ToString();


                // get the current record guid from context


                Guid leadRecordGuid = entity.Id;



                // Define variables to store Preimage and Postimage

                string pretopic = string.Empty; string posttopic = string.Empty; 


                // in below leadimage has been added in plugin registration tool


                // get PreImage from Context


                if (context.PreEntityImages.Contains("LeadTopicImage") && context.PreEntityImages["LeadTopicImage"] is Entity)

                {


                    Entity preMessageImage = (Entity)context.PreEntityImages["LeadTopicImage"];

                    // get topic field value before database update perform

                    pretopic = (String)preMessageImage.Attributes["subject"];


                }



                // get PostImage from Context

                if (context.PostEntityImages.Contains("LeadTopicImage") &&

                       context.PostEntityImages["LeadTopicImage"] is Entity)


                {


                    Entity postMessageImage = (Entity)context.PostEntityImages["LeadTopicImage"];


                    // get topic field value after database update performed

                    posttopic = (String)postMessageImage.Attributes["subject"];


                }



                // update the old and new values of topic field in description field


                Entity leadObj = new Entity("lead", context.PrimaryEntityId);

                //service.Retrieve(context.PrimaryEntityName, leadRecordGuid, new ColumnSet("description"));


                leadObj["description"] =

                "Pre-Image of description- " + pretopic + "   " + "Post-Image of description-- " + posttopic;


                service.Update(leadObj);


            }

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