Generic Repository Pattern for Entity Framework

GenericRepository.cs

//Generic Repository Pattern for Entity Framework
//http://www.tugberkugurlu.com/archive/generic-repository-pattern-entity-framework-asp-net-mvc-and-unit-testing-triangle
public abstract class GenericRepository<C, T> : 
     IDisposable, IGenericRepository<T> where T : class where C : DbContext, new() {

    private C _entities = new C();
    public C Context {

        get { return _entities; }
        set { _entities = value; }
    }

    public virtual IQueryable<T> GetAll() {

        IQueryable<T> query = _entities.Set<T>();
        return query;
    }

    public IQueryable<T> FindBy(System.Linq.Expressions.Expression<Func<T, bool>> predicate) {

        IQueryable<T> query = _entities.Set<T>().Where(predicate);
        return query;
    }

    public virtual void Add(T entity) {
        _entities.Set<T>().Add(entity);
    }

    public virtual void Delete(T entity) {
        _entities.Set<T>().Remove(entity);
    }

    public virtual void Edit(T entity) {
        _entities.Entry(entity).State = System.Data.Entity.EntityState.Modified;
    }

    public virtual void Save() {
        _entities.SaveChanges();
    }
    
    //Implementing IDisposable correctly http://msdn.microsoft.com/en-us/library/ms244737.aspx
    public void Dispose()
    {
        Dispose(true);
        GC.SuppressFinalize(this);
    }

    // The bulk of the clean-up code is implemented in Dispose(bool)
    protected virtual void Dispose(bool disposing)
    {
        if (disposing) 
        {
            _entities.Dispose();
        }
    }   
}

public interface IGenericRepository<T> where T : class
{

   IQueryable<T> GetAll();
   IQueryable<T> FindBy(Expression<Func<T, bool>> predicate);
   void Add(T entity);
   void Delete(T entity);
   void Edit(T entity);
   void Save();
}