What am I doing wrong on my program?

// Creates a HomeworkAssignment class

// instantiates two objects

// and prompts the user for infromation about two courses

using static System.Console;

class DebugNine1

{

static void Main()

{

HomeworkAssignment course1 = new HomeworkAssignment();

HomeworkAssignment course2 = new HomeworkAssignment();

string entryString;

int exercises;

// Get info for first class

Write("What class do you have homework for? ");

entry = ReadLine();

course1.className = entryString;

Write("How many exercises must you complete? ");

entryString = ReadLine(entry);

int.TryParse(entryString, exercises);

exercises = course1.NumberOfExercises;

// Get info for another class

Write("What class do you have homework for? ");

entryString = ReadLine();

course2.className = entrystring;

Write("How many exercises must you complete? ");

entryString = ReadLine();

char.TryParse(entryString, exercises);

course2.NumberOfExercises = exercises;

WriteLine("You have {0} minutes of homework for {1}",

course1.timeToComplete, course1.ClassName);

WriteLine("and {0} more minutes for {1}",

course2.timeToComplete,course2.ClassName);

}

class HomeworkAssignment

{

private int numberOfExercises;

private int timeToComplete;

// 10 minutes to complete each exercise

private const int TIME_PER_EXERCISE = 10;

public ClassName {get; set};

public int NumberOfExercises

{

get

{

return numberOfexercises;

}

set

{

numberOfExercises = number;

CalcCompletionTime();

}

public double TimeToComplete

{

get

{

return timeToComplete;

}

private void CalcCompletionTime()

{

timeToComplete = numberOfExercises * TIME_PER_EXERCISE;

}