protected void btnSubmit_Click(object sender, EventArgs e)
        {
            var      list           = CheckBoxHomework.Items.Cast <ListItem>().Where(item => item.Selected == true).Select(item => item.Value);
            var      result         = string.Join(",", list);
            User     user           = (from c in db.Users where c.Token.Contains(HttpContext.Current.User.Identity.Name) select c).FirstOrDefault();
            UserData userDataLogOut = (from c in db.UserDatas where c.Login.Value.Date.Equals(DateTime.Now.Date) & c.UserID.Equals(user.ID) select c).FirstOrDefault();

            userDataLogOut.Logout   = DateTime.Now;
            userDataLogOut.Homework = result;
            db.SubmitChanges();
            CheckBoxHomework.ClearSelection();
            gus.Attributes["style"]     = "display:none;";
            btnCafe.Text                = "CheckIn";
            btnCafe.Enabled             = false;
            btnCafe.Attributes["style"] = "background-color:none; margin-bottom:10px;";
        }
 protected void btnCancel_Click(object sender, EventArgs e)
 {
     CheckBoxHomework.ClearSelection();
     gus.Attributes["style"] = "display:none;";
 }