using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Microsoft.Xrm.Sdk;

namespace SamplePlugins {
   public class PostCreateContact:IPlugin {
      /// A plug-in that creates a follow-up task activity when a new account is created.
      /// Register this plug-in on the Create message, account entity,
      /// and asynchronous mode.

      public void Execute(IServiceProviderserviceProvider) {
         // Obtain the execution context from the service provider.
         IPluginExecutionContext context =(IPluginExecutionContext)
            serviceProvider.GetService(typeof(IPluginExecutionContext));

         // The InputParameters collection contains all the data
            passed in the message request.

         if(context.InputParameters.Contains("Target")&&
            context.InputParameters["Target"]isEntity) {
            
            // Obtain the target entity from the input parameters.
            Entity entity = (Entity)context.InputParameters["Target"];
            try {
               
               // Create a task activity to follow up with the account customer in 7 days
               Entity followup = new Entity("task");
               followup["subject"] = "Send e-mail to the new customer.";
               followup["description"] =
                  "Follow up with the customer. Check if there are any new issues
                  that need resolution.";
               
               followup["scheduledstart"] = DateTime.Now;
               followup["scheduledend"] = DateTime.Now.AddDays(2);
               followup["category"] = context.PrimaryEntityName;

               // Refer to the contact in the task activity.
               if(context.OutputParameters.Contains("id")) {
                  Guid regardingobjectid = new Guid(context.OutputParameter
                     s["id"].ToString());
                  string regardingobjectidType = "contact";
                  followup["regardingobjectid"] = 
                     new EntityReference(rega rdingobjectidType,regardingobjectid);
               }
               
               // Obtain the organization service reference.
               IOrganizationServiceFactory serviceFactory =
                  (IOrganizationSer viceFactory)serviceProvider.GetService
                  (typeof(IOrganizationServiceFactory));
               IOrganizationService service = 
                  serviceFactory.CreateOrganizationService(context.UserId);

               // Create the followup activity
               service.Create(followup);
            } catch(Exception ex) {
               throw new InvalidPluginExecutionException(ex.Message);
            }
         }
      }
   }
}

throw new InvalidPluginExecutionException(ex.Message);