public string FillBySubjectHomeWork(string PupilID, string ChooseSubjectCode) { Users PupilClass = new Users(); string PupilClassCode = PupilClass.GetPupilOtClass(PupilID); Dictionary <string, string> LessonsList = new Dictionary <string, string>(); LessonsList = (Dictionary <string, string>)(Session["LessonsList"]); string LessonCode = KeyByValue(LessonsList, ChooseSubjectCode); HomeWork HomeWork = new HomeWork(); DataTable DT = HomeWork.FillBySubjectHomeWork(PupilID, LessonCode); JavaScriptSerializer js = new JavaScriptSerializer(); string jsonStringFillBySubjectHomeWork = js.Serialize(DT); return(jsonStringFillBySubjectHomeWork); }