列表没有填充下拉列表

Question

我正在使用标准列表方法进行查找我将其用于winforms并且只是尝试在网络上重复使用并且不显示我的项目。

    public List<SISLookupLists> GetGender()
    {
        List<SISLookupLists> lookups = new List<SISLookupLists>();

        try
        {
            var q = from lookup in schoolEntities.Genders
                    orderby lookup.description
                    select new
                    {
                        Code = lookup.code,
                        Description = lookup.description.Trim()
                    };

            if (q != null)
            {
                Array.ForEach(q.ToArray(), l =>
                {
                    lookups.Add(new SISLookupLists(l.Code, l.Description));
                });
            }
        }
        catch (Exception ex)
        {
            throw new EntityContextException("GetGender failed.", ex);
        }

        return lookups;
    }

        public SISDBContext _db = new SISDBContext();

        rdGender.DataSource = _db.GetGender();
        rdGender.DataTextField = "Description";
        rdGender.DataValueField= "Code";            
        rdGender.DataBind();  

知道我在这里做错了什么。