public abstract class CRUDDA<T>
{
...
        internal abstract Mapper<T> CRUDMapper { get; }
        protected abstract string AddSPName { get; }
        public virtual void Add(T entityToAdd)
        {
            using (IDbConnection Conn = DBObjectsFactory.CreateConnection())
            {
                IDbCommand InsertCommand = DBObjectsFactory.CreateSPCommand(Conn, AddSPName);
                CRUDMapper.BuildAddCommand(InsertCommand, entityToAdd);
                Conn.Open();
                InsertCommand.ExecuteNonQuery();
            }
        }

}
public class MyClassCRUDDA  :CRUDDA<MyClass> 
{  
...
      internal override Mapper<MyClass> CRUDMapper
        {
            get { return new UserMapper(); }
        }

        protected override string AddSPName { get { return "dbo.MyClass_Add"; } }

        protected override string UpdateSPName { get { return "dbo.MyClass_Update"; } }

        protected override string DeleteSPName { get { return "dbo.MyClass_Delete"; } }

        protected override string GetSPName { get { return "dbo.MyClass_Get"; } }
}

internal class MyClassMapper : Mapper<MyClass>
{
...
        protected internal override void FillFromReader(IDataReader reader, MyClass entity)
        {
            entity.Id = reader["Id"].ToString();
            entity.Field1= reader["SomeField1"].ToString();
            entity.Field2= reader["SomeField2"].ToString();
        }

        protected internal override void BuildAddCommand(IDbCommand cmd, MyClass entityToAdd)
        {
            cmd.Parameters.Add(DBObjectsFactory.CreateParameter("@id", entityToAdd.Id));
            cmd.Parameters.Add(DBObjectsFactory.CreateParameter("@someField1", entityToAdd.Field1));
            cmd.Parameters.Add(DBObjectsFactory.CreateParameter("@someField2", entityToAdd.Field2));
        }

        protected internal override void BuildUpdateCommand(IDbCommand cmd, MyClass entityToUpdate)
        {
            cmd.Parameters.Add(DBObjectsFactory.CreateParameter("@id", entityToUpdate.Id));
            cmd.Parameters.Add(DBObjectsFactory.CreateParameter("@someField1", entityToUpdate.Field1));
            cmd.Parameters.Add(DBObjectsFactory.CreateParameter("@someField2", entityToUpdate.Field2));
        }
}