Plugin not getting triggered at close event of incident entity

Hi ,

I am trying to restrict the closing of parent case when a associated child case is open . I am aware that this can be done using parent child case setting in service management. But due to some requirement issue i am not using it. So for this i am trying to write a pluign . I tried two approaches :-

1) First i wrote a plugin at close message of incident entity. Yet somehow , this pluign is never getting triggered.

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using Microsoft.Xrm.Sdk;

using Microsoft.Xrm.Sdk.Query;

namespace CloseCase

{

public class ParentCase : IPlugin

{

public void Execute(IServiceProvider serviceProvider)

{

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

IOrganizationServiceFactory serviceFactory =

(IOrganizationServiceFactory)serviceProvider.GetService

(typeof(IOrganizationServiceFactory));

IOrganizationService service =

serviceFactory.CreateOrganizationService(context.UserId);

if (context.InputParameters.Contains("Target") && context.InputParameters["Target"] is Entity)

{

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

QueryExpression qe2 = new QueryExpression("incident");

ColumnSet col2 = new ColumnSet("parentcaseid");
qe2.Criteria.AddCondition("parentcaseid", ConditionOperator.Equal, entity.Id);

qe2.Criteria.AddCondition("statuscode", ConditionOperator.Equal, 1);

EntityCollection coll = service.RetrieveMultiple(qe2);

if (coll.Entities.Count > 0)

{

throw new Exception("child record not closed");

}

}

2) In 2nd approach i wrote a plugin on create of incidentResolution entity , and i am able to achieve my desired functionality i.e restricting the closing of parent case.