t.cs

public ProviderManagerProfileViewModel Update(ProviderManagerProfileViewModel data)
{
    var providerManagerProfile = Context.GetRepository<ProviderManagerProfile>().GetById(data.Id);

    providerManagerProfile.User.Email = data.Email;
    providerManagerProfile.User.Name = data.Name;

    var loggedUserStoresIds = LoggedUser.GetStores().Select(s => s.StoreId).ToArray();
    var profiles = providerManagerProfile.User.Profiles.OfType<ProviderManagerProfile>().ToArray();
    var mutualIds = data.StoresIds.Intersect(profiles.Select(pmp => pmp.StoreId).ToArray());

    foreach (var profile in profiles.Where(p => !mutualIds.Contains(p.StoreId) && loggedUserStoresIds.Contains(p.StoreId)))
    {
        profile.RemovedDate = DateTime.Now;
    }

    foreach (var storeId in data.StoresIds.Where(id => !mutualIds.Contains(id) && loggedUserStoresIds.Contains(id)))
    {
        providerManagerProfile.User.Profiles.Add(Context.Add(new ProviderManagerProfile
        {
            StoreId = storeId
        }));
    }

    Context.Save(false);

    return providerManagerProfile.Format();
}