Create a Task plugin in MS Dynamics CRM

 using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using Microsoft.Xrm.Sdk;

using System.ServiceModel;

namespace MyPlugins

{

    public class TaskCreate : IPlugin

    {

        public void Execute(IServiceProvider serviceProvider)

        {

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

            // If you are not registering the plug-in in the sandbox, then you do  

            // not have to add any tracing service related code.  

            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 reference which you will need for  

            // web service calls.  

            IOrganizationServiceFactory serviceFactory =

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

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

            // IOrganizationService adminservice = serviceFactory.CreateOrganizationService(new Guid(""));

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

             

                try

                {

                  //string key = context.SharedVariables["key1"].ToString();

                    // Plug-in business logic goes here.  

                    Entity taskRecord = new Entity("task");

                    // Single line of text

                    taskRecord.Attributes.Add("subject", "Follow up");

                    taskRecord.Attributes.Add("description", "Please follow up with contact.");

                    // Date

                    taskRecord.Attributes.Add("scheduledend", DateTime.Now.AddDays(6));

                    // Option set value as "High"

                    taskRecord.Attributes.Add("prioritycode", new OptionSetValue(2));

                    // Parent record or Look up

                    // taskRecord.Attributes.Add("regardingobjectid", new EntityReference("contact", contact.Id));

                    taskRecord.Attributes.Add("regardingobjectid", contact.ToEntityReference());

                    Guid taskGuid = service.Create(taskRecord);

                    

                    tracingService.Trace("task created with Guid {0}", taskGuid.ToString());

                }

                catch (FaultException<OrganizationServiceFault> ex)

                {

                    throw new InvalidPluginExecutionException("An error occurred in MyPlug-in.", ex);

                }

                catch (Exception ex)

                {

                    tracingService.Trace("MyPlugin: {0}", ex.ToString());

                    throw;

                }

            }

        }

    }

}