Wcf not saving changes - database

Question

I created a project to expose some actions of a MVC app to a Winforms app one of these actions must save a new visitor to the database, i have a MVC project that has a reference to a local service(using EF6) project that writes on the database thast OK!, but when i create the WCF project to use the service project and call the write method, this complete ok with no errors but doesn´t write the data.
Here is the code of my WCF
public async Task<bool> CreateAsync(VisitanteComposite item)
{
try
{
var myTask = Task.Factory.StartNew(() => _visitanteServicio.Create(Mapper.Map<Visitante>(item)));
await myTask;
return myTask.IsCompleted;
}
catch (Exception)
{
return false;
}
}
These is the generic create Method
public virtual void Create(T item)
{
try
{
Repositorio.Add(item);
UnitOfWork.SaveChanges();
}
catch (Exception ex)
{
//_logger.Debug(item.GetType() + " Error al crear: " + ex.Message);
throw new ServiceException("Ocurrio un error al crear el item", ex);
}
}
These is the repository method
public virtual void Add(T entity)
{
DbContext.Set<T>().Add(entity);
}
I rewrite the WCF to this and work
public async Task<bool> CreateAsync(VisitanteComposite item)
{
try
{
var myTask = Task.Factory.StartNew(() =>
{
using (var db = new ModelContainer())
{
var visitante = new Visitante
{
Apellido = item.Apellido,
Nombre = item.Nombre,
TipoDocumentoId = item.TipoDocumentoId,
NumeroDocumento = item.NumeroDocumento
};
AplicarFiltros(visitante);
db.Set<Visitante>().Add(visitante);
db.SaveChanges();
}
});
await myTask;
return myTask.IsCompleted;
}
catch (Exception)
{
return false;
}
}
but i want to reuse the previous methods