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);
}