public class DbContextDomainService<TContext> : DomainService where TContext : DbContext, new()
{
  private TContext _DbContext;
  protected TContext DbContext
  {
    get
    {              
      return _DbContext ?? (_DbContext = CreateDbContext());
    }
  }

public partial class Entities
{
 
  public void Insert<T>(T entity) where T : class
  {
    if (entity == null) throw new ArgumentNullException("entity");
 
    // Note: changing the state to Added on a detached entity is the same as calling
    // Add on the DbSet.                    
    Entry(entity).State = EntityState.Added;