Plugin C# code for populatefullname – post image, post operation

using System;
using Microsoft.Xrm.Sdk;

namespace ASK1025Populatefullname
{
    public class PopulateFullname : IPlugin
    {
        public void Execute(IServiceProvider serviceProvider)
        {
            // Obtain the tracing service
            ITracingService tracingService =
            (ITracingService)serviceProvider.GetService(typeof(ITracingService));

            // Obtain the execution context from the service provider.  
            IPluginExecutionContext context = (IPluginExecutionContext)
                serviceProvider.GetService(typeof(IPluginExecutionContext));
            if (context.Depth > 1)
            {
                return;
            }

            // The InputParameters collection contains all the data passed in the message request.  
            if (context.InputParameters.Contains("Target") &&
                context.InputParameters["Target"] is Entity)
            {
                // Obtain the target entity from the input parameters.  
                Entity SourceData = (Entity)context.InputParameters["Target"];//syntax for post image
              //if we use image use this to get data insted of using sourcedata
                                                                                      //remember when we set use only sourcedata


                // Obtain the IOrganizationService instance which you will need for  
                // web service calls.  
                IOrganizationServiceFactory serviceFactory =
                    (IOrganizationServiceFactory)serviceProvider.GetService(typeof(IOrganizationServiceFactory));
                IOrganizationService service = serviceFactory.CreateOrganizationService(context.UserId);

                try
                {
                    string firstName = " ";
                    string lastName = " ";
                    if (context.MessageName.ToLower() == "create")
                    {
                        // Plug-in business logic goes here.  
                        
                        if (SourceData.Contains("sdc_firstname") && SourceData["sdc_firstname"] != null)
                        {
                            firstName = (string)SourceData["sdc_firstname"];
                        }
                        //----get syntax for plugin --single line filed
                        if (SourceData.Contains("sdc_secondname") && SourceData["sdc_secondname"] != null)
                        {
                            lastName = (string)SourceData["sdc_secondname"];
                        }

                        //--fullname
                        string fullname = firstName + " " + lastName;

                        //--set syntax for plugin --single line of syntax
                        SourceData["sdc_name"] = fullname;
                    }
                    else
                    {
                        Entity postValues = (Entity)context.PostEntityImages["latestvalues"];
                        // Plug-in business logic goes here.  
                        
                        if (postValues.Contains("sdc_firstname") && postValues["sdc_firstname"] != null)
                        {
                            firstName = (string)postValues["sdc_firstname"];
                        }
                        //----get syntax for plugin --single line filed
                        if (postValues.Contains("sdc_secondname") && postValues["sdc_secondname"] != null)
                        {
                            lastName = (string)postValues["sdc_secondname"];
                        }

                        //--fullname
                        string fullname = firstName + " " + lastName;

                        //--set syntax for plugin --single line of syntax
                        //SourceData["sdc_name"] = fullname;

                        Entity entUpdate = new Entity(); // creating new object
                        entUpdate.LogicalName = SourceData.LogicalName; // we need to give proper instructions which entity we need to update
                        entUpdate.Id = SourceData.Id; //we will have multiple records in entity.. so we need to update guid of record that we need to update
                        entUpdate["sdc_name"] = fullname; // in record we have multiple fileds so we need to..set which filed we need to update
                        service.Update(entUpdate); //send data to server
                    }
                }



                catch (Exception ex)
                {
                    tracingService.Trace("PopulateFullname: {0}", ex.ToString());
                    throw;
                }
            }
        }
    }
}