COA.EnterpriseServices/COA.EnterpriseServices.DataAccess/IDataAccess.cs

using System;
using System.Collections.Generic;
using System.Linq.Expressions;

namespace COA.EnterpriseServices.DataAccess
{
    public interface IDataAccess<T> where T : class, IRecord
    {
        bool Add(T item);

        bool Update(T item);

        ICollection<T> Get(Expression<Func<T, bool>> query);
    }
}