protected void AddUserBTN_Click(object sender, EventArgs e)
    {
        string ClassCode = "";
        Dictionary <string, string> Classes = new Dictionary <string, string>();

        ClassCode = ChooseClassDLL.SelectedValue;
        Subject s           = new Subject();
        string  LessonsCode = s.GetSubjectCodeBySubjectName(ChooseLessonsDLL.SelectedValue);


        string date      = DateTime.Today.ToShortDateString();
        string TeacherId = Request.Cookies["UserID"].Value;

        HomeWork HW = new HomeWork();
        Users    u = new Users();
        string   day = DDLday.SelectedValue, month = DDLmonth.SelectedValue, year = DDLyear.SelectedValue;
        string   Bday = day + "/" + month + "/" + year;

        if (day == "יום" || month == "חודש" || year == "שנה")
        {
            ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "success", "alert('תאריך לא יכול להיות ריק');", true);
            return;
        }
        else if (!u.IsLegalBday(day, month))
        {
            ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "success", "alert('תאריך לא חוקי');", true);
            return;
        }
        int res1 = HW.InserHomeWork(LessonsCode, HomeWorkDesc.Text, TeacherId, ClassCode, Bday, ChangeHagashaCB.Checked);

        if (res1 == 1)
        {
            ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "success", "alert('שיעורי בית נוספו בהצלחה'); location.href='THomeWorkInsert.aspx';", true);
        }
        else
        {
            ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "success", "alert('הייתה בעיה בהוספת שיעורי בית, בדוק נתונים');", true);
        }
    }