CRM 2011 custom workflow: Cancelling an Activity and Adding Note to it

After a lot of hardship i have come up with workflow which does a very straight forward thing. it looks for an activity with a certain subject line. when it finds the activity in question, if the activity has not been cancelled, it cancels it after adding a note to it. i have done it for all the activity types. to avoid duplication i am just sticking with the first two (task and email). Since i'm copy-pasting, there is a chance that there will be unmatched parenthesis.

 using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
//my usings
using System.Activities;
using Microsoft.Xrm.Sdk;
using Microsoft.Xrm.Sdk.Workflow;
using Microsoft.Xrm.Sdk.Messages;
using Microsoft.Xrm.Sdk.Query;
using System.Collections.ObjectModel;
using Microsoft.Crm.Sdk.Messages;
using Microsoft.Xrm.Sdk.Client;
using Microsoft.Xrm.Sdk.Deployment;
using Microsoft.Xrm.Sdk.XmlNamespaces;
using System.Activities.Debugger;
using Microsoft.IdentityModel.Protocols.WSTrust;
namespace Don_Det_onUpdate
{
public sealed class DonarDetailsOnApproved : CodeActivity
{
[Input("Type of Activity")]
[RequiredArgument]
[Default("4212")]
[AttributeTarget("activitypointer","activitytypecode")]
public InArgument TypeOfActivity { get; set; }
[Input("Subject Line")]
[RequiredArgument]
public InArgument SubjectLine { get; set; }
protected override void Execute(CodeActivityContext context)
{
IWorkflowContext con = context.GetExtension();
IOrganizationServiceFactory objIOrganizationServiceFactory = context.GetExtension();
IOrganizationService service = objIOrganizationServiceFactory.CreateOrganizationService(con.UserId);
OptionSetValue ActType = TypeOfActivity.Get(context);
try
{
var crm = new XrmServiceContext(service);
Int16? ActivityId = Convert.ToInt16(ActType.Value);
// 07 july by imran
if (ActivityId.HasValue)
{
switch (ActivityId)
{
// this is a task...
case 4212:
var TaskList = crm.TaskSet.Where(t => t.Subject == SubjectLine.Get(context).ToString() && t.StateCode != TaskState.Canceled);
foreach (Task tsk in TaskList)
{
var note = new Annotation
{
Subject = "System generated note",
NoteText = "This activity is cancelled and no longer required.",
ObjectId = new EntityReference(tsk.LogicalName, tsk.Id),
ObjectTypeCode = tsk.GetType().ToString().ToLower()
};
crm.AddObject(note);
crm.UpdateObject(tsk);
crm.SaveChanges();
var k = new SetStateRequest
{
EntityMoniker = new EntityReference(tsk.LogicalName, tsk.Id),
State = new OptionSetValue(2),
Status = new OptionSetValue(-1)
};
crm.Execute(k);
break;
}
break;
case 4202: // email
var EmailList = crm.EmailSet.Where(t => t.Subject == SubjectLine.Get(context).ToString() && t.StateCode != EmailState.Canceled);
foreach (Email eml in EmailList)
{
var note = new Annotation
{
Subject = "System generated note",
NoteText = "This activity is cancelled and no longer required.",
ObjectId = new EntityReference(eml.LogicalName, eml.Id),
ObjectTypeCode = eml.GetType().ToString().ToLower()
};
crm.AddObject(note);
crm.UpdateObject(eml);
crm.SaveChanges();
var k = new SetStateRequest
{
EntityMoniker = new EntityReference(eml.LogicalName, eml.Id),
State = new OptionSetValue(2),
Status = new OptionSetValue(-1)
};
crm.Execute(k);
break;
}
    break;
   default:
break;
}
}
}
catch (Exception ex)
{
}
}
}
}         



      

the question that pops up as soon as you come across to the code. that how the hell you come across to the activitytype (which i used in switch). i am damn sure there are lots of smart ways to find them. but i debugged and looked for the value. (silly me...)