protected void testConflict()
        {
            Stack<Class> schedule = new Stack<Class>();
            Class firstClass = new Class();
            Class secondClass = new Class();
            Class thirdClass = new Class();

            firstClass.startTime = 1000;
            firstClass.endTime = 1050;
            firstClass.days.Add("M");
            firstClass.days.Add("W");
            firstClass.days.Add("F");

            secondClass.startTime = 1000;
            secondClass.endTime = 1050;
            secondClass.days.Add("T");
            secondClass.days.Add("R");

            thirdClass.startTime = 1000;
            thirdClass.endTime = 1050;
            thirdClass.days.Add("M");
            thirdClass.days.Add("W");
            thirdClass.days.Add("F");

            schedule.Push(firstClass);
            schedule.Push(secondClass);
            schedule.Push(thirdClass);

            if (noConflict(schedule))
            {
                Response.Write("hello");
            }
        }
 protected void CreateCourseStack()
 {
     courses = new Stack<Course>();
     SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["Courses"].ConnectionString);
     while(lbAdded.Items.Count > 0){
         Course currentCourse = new Course();
         string item = lbAdded.Items[0].ToString();
         string qry = "select * from Schedule where CourseNumber=@number";
         SqlCommand cmd = new SqlCommand(qry, conn);
         cmd.Parameters.AddWithValue("@number", item);
         conn.Open();
         SqlDataReader reader = cmd.ExecuteReader();
         while (reader.Read())
         {
             Class currentClass = new Class();
             currentClass.CRN = reader["CRN"].ToString();
             currentClass.courseNumber = reader["CourseNumber"].ToString();
             currentClass.sectionNumber = reader["SectionNumber"].ToString();
             currentClass.startTime = Convert.ToInt16(reader["StartTime"]);
             currentClass.endTime = Convert.ToInt16(reader["EndTime"]);
             string days = reader["Days"].ToString();
             for (int i = 0; i < days.Length; i++)
             {
                 currentClass.days.Add(days.Substring(i,1));
             }
             currentCourse.Classes.Push(currentClass);
         }
         courses.Push(currentCourse);
         lbAdded.Items.RemoveAt(0);
         conn.Close();
     }
 }