Cannot create a contact in CRM 2011 Online using a plug-in - dynamics-crm-2011

Question

Below is the code I am using to create a contact in CRM 2011 online. It's not throwing any error but it also not creating any contact. I have registered the plugin on Post-Operation create event of the e-mail entity. I don't know if I am missing something. Any help would be appreciate.
public class RegistrationPlugin : IPlugin
{
private OrganizationServiceContext oContext;
public void Execute(IServiceProvider serviceProvider)
{
Microsoft.Xrm.Sdk.IPluginExecutionContext context = (Microsoft.Xrm.Sdk.IPluginExecutionContext)
serviceProvider.GetService(typeof(Microsoft.Xrm.Sdk.IPluginExecutionContext));
IOrganizationServiceFactory factory = (IOrganizationServiceFactory)serviceProvider.GetService(typeof(IOrganizationServiceFactory));
IOrganizationService service = factory.CreateOrganizationService(context.UserId);
oContext = new OrganizationServiceContext(service);
//service.EnableProxyTypes();
if (context.InputParameters.Contains("Target") &&
context.InputParameters["Target"] is Entity)
{
try
{
Entity entity = (Entity)context.InputParameters["Target"];
if (entity.LogicalName == "email")
{
Guid _contactId;
var contact = new Contact()
{
FirstName = "Mary Kay",
LastName = "Andersen",
Address1_Line1 = "23 Market St.",
Address1_City = "Sammamish",
Address1_StateOrProvince = "MT",
Address1_PostalCode = "99999",
Telephone1 = "12345678",
EMailAddress1 = "marykay#contoso.com",
Id = Guid.NewGuid()
};
_contactId = contact.Id;
oContext.AddObject(contact);
}
}
catch (Exception x)
{
throw new Exception(x.ToString() + "\n" + x.InnerException.ToString());
}
}
}
}

Answer 1

I can see that you're missing one statement which is:
oContext.AddObject(contact);
oContext.SaveChanges(); // <= Saves the changes

Answer 2

It does solves the problem but it is now throwing another error:
Unhandled Exception: System.ServiceModel.FaultException`1[[Microsoft.Xrm.Sdk.OrganizationServiceFault, Microsoft.Xrm.Sdk, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35]]: Unexpected exception from plug-in (Execute): Microsoft.Crm.Sdk.Samples.RegistrationPlugin: System.Exception: Microsoft.Xrm.Sdk.SaveChangesException: An error occured while processing this request. ---> System.TypeLoadException: Inheritance security rules violated while overriding member: 'Microsoft.Crm.Services.Utility.DeviceRegistrationFailedException.GetObjectData(System.Runtime.Serialization.SerializationInfo, System.Runtime.Serialization.StreamingContext)'. Security accessibility of the overriding method must match the security accessibility of the method being overriden.
at System.Reflection.RuntimeAssembly.GetExportedTypes(RuntimeAssembly assembly, ObjectHandleOnStack retTypes)
at System.Reflection.RuntimeAssembly.GetExportedTypes()
at Microsoft.Xrm.Sdk.KnownProxyTypesProvider.LoadKnownTypes(Assembly assembly)
at Microsoft.Xrm.Sdk.KnownProxyTypesProvider.RegisterAssembly(Assembly assembly)
at Microsoft.Xrm.Sdk.AssemblyBasedKnownProxyTypesProvider.GetTypeForName(String name, Assembly proxyTypesAssembly)
at..................
It seems to me a problem of rights. Can you suggest what I am missing now?
UPDATE: I solved the problem by adding OwnerID = new EntityReference("systemuser", context.UserId)

Answer 3

hmm, I think you don't need to complete the ID field, because when you will create it, the CRM will send you the ID.
Don't know if it could help you, cause I don't create a contact but an incident. But I think the process is the same. So I let you look.
private Guid createCase(IOrganizationService CrmService, Entity email)
{
ITracingService tracingService = (ITracingService)serviceProvider.GetService(typeof(ITracingService));
tracingService.Trace("Just to tracing my plugin");
/* CREATE AN ENTITY: incident here, but could be contact, account, ... */
Entity incident = new Entity("incident");
incident["title"] = email.Attributes["subject"].ToString();
incident["caseorigincode"] = new OptionSetValue(2);
EntityCollection ec = email.Attributes["from"] as EntityCollection;
Entity from = ec.Entities.FirstOrDefault();
incident["customerid"] = (EntityReference)from.Attributes["partyid"];
/* END */
tracingService.Trace("tracing 2.");
/* HERE YOU CREATE THE RECORD IN THE CRM */
Guid caseid = CrmService.Create(incident);
/* END */
tracingService.Trace("tracing 3. ID: "+ caseid.ToString());
return caseid;
}