C# Visual Studio Console does not display output, no error message is given

Question

I have a program that reads a text file with student information and is supposed to compute average grades and present them in a table. I have only modified method PopulateStudents() in class studentS and MainMethod() in GradesUI. The rest of the work was provided by the prompt. Initially I was getting an index out of bounds error but after some fiddling I'm not getting an error but I am also not getting any results showing on the console. Any help would be appreciated:

   class GradesUI

{
     StudentS myStudentS;
     public void MainMethod()
    {
        //instance an object of StudentUI..
        myStudentS = new StudentS();
        //Call StudentUI->PopulateStudents..
        string path = @"C:\Users\PathgoesHere.txt";
        bool returnValue = myStudentS.PopulateStudents;
        //Verify if the file was created correctly by checking the return value.
        if (returnValue == true)
        {
            DisplayInfo();
        }
        else
            Console.WriteLine("There was a problem loading the file");        //else display error message.

    }

    void DisplayInfo()
    {
        Console.WriteLine("Student id\tLast Name\tAverage  \tGrade");

        for (int index = 0; index < myStudentS.ListLength; index++)
        {

            Console.WriteLine(" {0} \t {1}    \t {2}    \t {3}", myStudentS.StudentID(index), myStudentS.StudentLastName(index), myStudentS.StudentAverage(index), myStudentS.StudentGrade(index));
        }
    }
}

}

class StudentS

  {

        List<Student> theStudentList;

    public bool PopulateStudents(string path)
    {
        theStudentList = new List<Student>();
        bool flag = false;
        int index2 = 3;
        try
        {
            List<string[]> strArrayList = new List<string[]>();
            using (StreamReader streamReader = new StreamReader(path))
            {
                string str;
                while ((str = streamReader.ReadLine()) != null)
                {
                    string[] strArray = str.Split(',');
                    strArrayList.Add(strArray);
                }
            }
            for (int index1 = 0; index1 < strArrayList.Count; ++index1)
            {
                string[] strArray = strArrayList[index1];
                Student student = new Student(strArray[0], strArray[1], strArray[2]); 

                while (index2 < strArray.Length)
                {
                    student.EnterGrade(int.Parse(strArray[index2]), int.Parse(strArray[index2 + 1]));
                    index2 += 2;
                }
                student.CalGrade();
                theStudentList.Add(student);
            }
        }
        catch (Exception e)
        {
            flag = true;
            Console.WriteLine(e);
        }
        return flag;
    }


    public int ListLength
    {
        get { return theStudentList.Count; }
    }

    public string StudentID(int index)
    {
        return theStudentList.ElementAt(index).ID;
    }

    public string StudentLastName(int index)
    {
        return theStudentList.ElementAt(index).NameLast;
    }

    public string StudentGrade(int index)
    {

        return theStudentList.ElementAt(index).LetterGrade;
    }

    public float StudentAverage(int index)
    {

        return theStudentList.ElementAt(index).Average;
    }

}

}

class Student {

//data member
        string nameFirst;
        string nameLast;
        string studentID;
        List<int> earned;
        List<int> possible;
        float average;
        string letterGrade;

    public Student() //default constructor
    {
        studentID = null;
        earned = new List<int>();
        possible = new List<int>();
    }
    public Student(string id)  //overloaded constructor
    {
        studentID = id;
        nameFirst = null;
        nameLast = null;
        earned = new List<int>();
        possible = new List<int>();
    }
    public Student(string id, string first, string last)  //overloaded constructor
    {
        nameFirst = first;
        nameLast = last;
        studentID = id;
        earned = new List<int>();
        possible = new List<int>();
    }
    
    public void EnterGrade(int earnedValue, int possValue)
    {
        earned.Add(earnedValue);
        possible.Add(possValue);
    }
    public float Average
    {
        get { return average; }
    }
    public string LetterGrade
    {
        get { return letterGrade; }
    }
    public string ID
    {
        get { return studentID; }
    }
    //accessor mutators //properties
    public string NameFirst
    {
        get  //accessor - getters
        {
            return nameFirst;
        }
        set  //mutator - setter
        {
            nameFirst = value;
        }
    }
    public string NameLast
    {
        get  //accessor - getters
        {
            return nameLast;
        }
        set  //mutator - setter
        {
            nameLast = value;
        }
    }
       

   public void CalGrade()
   {
       int totalEarned = 0;
       int totalPossible = 0;
         
       foreach (int item in earned)
           totalEarned += item;

       foreach (int item in possible)
           totalPossible += item;

       average = (float)totalEarned / totalPossible;  //you could think that this is stored in class Level but not.
       average = (float)Math.Round(average, 2);

       
       if (average >= .90 )
           letterGrade = "A";

       if (average >= .80 && average < .90)
           letterGrade = "B";

       if (average >= .70 && average < .80)
           letterGrade = "C";

       if (average >= .60 && average < .70)
           letterGrade = "D";

       if (average < .60)
           letterGrade = "U";

   }
}

}