MVC DAL邦定下拉

  public List<Drop> Select()

{            

string sql = "select * from StuClass";

DataTable dt = DbHelperSQL.ExecuteDataTable(DbHelperSQL.ConnB2c, CommandType.Text, sql);

 List<Drop> sel = JsonConvert.DeserializeObject<List<Drop>>(JsonConvert.SerializeObject(dt));  

 return sel;

        }