I don't understand why I am getting a StackoverFlowException??

[StephClaudio]

I am new to C Sharp, and have been working on this code for a few days. I keep getting a StackoverFlowException and I don't know what that means, since we haven't covered it in class. Any guidance would be greatful. Thanks!

using System;
public class BookDemo
{
    public static void Main()
    {
        Book Book = new Book();
        TextBook Text = new TextBook();
        CoffeeTableBook Coffee = new CoffeeTableBook();
 
        Book.Isbn = "0001112223330 ";
        Book.Title = "The Story of Day of the Dead";
        Book.Author = "Victor Juan";
        Book.Price = 99.95;
 
        Book.Isbn = "2323565678 ";
        Book.Title = "The Adventure guide";
        Book.Author = "Steven Chard";
        Book.Price = 55.00;
 
        Text.Isbn = "1113334444569 ";
        Text.Title = "Computers, How they Work";
        Text.Author = "John Smith";
        Text.GradeLevel = 10;
        Text.Price = 132.00;
 
        Text.Isbn = "9995558475890 ";
        Text.Title = "The Fundementals of Math";
        Text.Author = "Marcia Brown";
        Text.GradeLevel = 3;
        Text.Price = 56.25;
 
        Coffee.Isbn = "1932279288 ";
        Coffee.Title = "Household Baggage";
        Coffee.Author = "Marna Krajeski";
        Coffee.Price = 46.25;
 
        Coffee.Isbn = "0757300065 ";
        Coffee.Title = "Chicken Soup for the Soul of America";
        Coffee.Author = "Jack Canfield";
        Coffee.Price = 125.75;
 
        Console.WriteLine("ISBN: {0}", Book.Isbn);
        Console.WriteLine("  {1} by {2} sells for {3}",
           Book.Title, Book.Author,
           Book.Price.ToString("C"));
 
        Console.WriteLine("\nISBN: {0}", Text.Isbn);
        Console.WriteLine("  {1} by {2} for grade {3} sells for {4}",
           Text.Title, Text.Author,
           Text.GradeLevel,
           Text.Price.ToString("C"));
 
        Console.WriteLine("\nISBN: {0}", Coffee.Isbn);
        Console.WriteLine("  {1} by {2} sells for {3}",
           Coffee.Title, Coffee.Author,
           Coffee.Price.ToString("C"));
    }
}
public class Book
{
    public string Isbn { get; set; }
    public string Title { get; set; }
    public string Author { get; set; }
    public double Price { get; set; }
}
public class TextBook : Book
{
    private int gradeLevel;
    const double LOWPRICE = 20.00;
    const double HIGHPRICE = 80.00;
    public int GradeLevel
    {
        get
        {
            return gradeLevel;
        }
        set
        {
            gradeLevel = value;
        }
    }
    new public double Price
    {
        get
        {
            return Price;
        }
        set
        {
            if (value < LOWPRICE)
                Price = LOWPRICE;
            else if (value > HIGHPRICE)
                Price = HIGHPRICE;
            else Price = value;
        }
    }
}
public class CoffeeTableBook : Book
{
    public const double LOWPRICE = 35.00;
    public const double HIGHPRICE = 100.00;
    new public double Price
    {
        get
        {
            return Price;
        }
        set
        {
            if (value < LOWPRICE)
                Price = LOWPRICE;
            else if (value > HIGHPRICE)
                Price = HIGHPRICE;
            else Price = value;
        }
    }
}

[hype261]

A StackOverFlowException is thrown for execution stack overflow errors, typically in case of a very deep or unbounded recursion.

My question is does your code compile? The only obvious error that I see is the line.

Book Book = new Book();

You are using a class name as a variable name.

[StephClaudio]

No my program does not compile, when I go to debug it says the error and then highlights the first curly brace in the below method.

{
   if (value < LOWPRICE)
       Price = LOWPRICE;
   else if (value > HIGHPRICE)
       Price = HIGHPRICE;
   else Price = value;
}
 

[Joseph Martell]

One common cause of a stack overflow is infinite recursion. Each function call pushes information onto the stack, so an infinite recursion keeps pushing data onto the stack until you get an overflow. That is what is happening in your case (I believe):

public class Book
{
    public string Isbn { get; set; }
    public string Title { get; set; }
    public string Author { get; set; }
    public double Price { get; set; }
}
public class TextBook : Book
{
    private int gradeLevel;
    const double LOWPRICE = 20.00;
    const double HIGHPRICE = 80.00;
    public int GradeLevel
    {
        get
        {
            return gradeLevel;
        }
        set
        {
            gradeLevel = value;
        }
    }
    //You named this property "Price".  Every unqualified reference
    //to "Price" in this class uses either the get or set
    // of this property
    new public double Price
    {
        get
        {
            //This is an infinitely recursive call to
            //the Price property get method.
            return Price;
        }
        set
        {
            if (value < LOWPRICE)
                Price = LOWPRICE;  //this accesses the set of the Price property of the TextBook class
            else if (value > HIGHPRICE)
                Price = HIGHPRICE;  // so does this
            else Price = value;  //so does this
        }
    }
}
 
//you have the same recursive calls in this class as well
public class CoffeeTableBook : Book
{
    public const double LOWPRICE = 35.00;
    public const double HIGHPRICE = 100.00;
    new public double Price
    {
        get
        {
            return Price;
        }
        set
        {
            if (value < LOWPRICE)
                Price = LOWPRICE;
            else if (value > HIGHPRICE)
                Price = HIGHPRICE;
            else Price = value;
        }
    }
}
 
 

That is how you get infinite recursion. You can fix this by fully qualifying the Price you are using in your TextBook and CoffeeTableBook classes:

public class Book
{
    public string Isbn { get; set; }
    public string Title { get; set; }
    public string Author { get; set; }
    public double Price { get; set; }
}
public class TextBook : Book
{
    private int gradeLevel;
    const double LOWPRICE = 20.00;
    const double HIGHPRICE = 80.00;
    public int GradeLevel
    {
        get
        {
            return gradeLevel;
        }
        set
        {
            gradeLevel = value;
        }
    }
    new public double Price
    {
        get
        {
            return base.Price;
        }
        set
        {
            if (value < LOWPRICE)
                base.Price = LOWPRICE;
            else if (value > HIGHPRICE)
                base.Price = HIGHPRICE;
            else base.Price = value;
        }
    }
}
public class CoffeeTableBook : Book
{
    public const double LOWPRICE = 35.00;
    public const double HIGHPRICE = 100.00;
    new public double Price
    {
        get
        {
            return base.Price;
        }
        set
        {
            if (value < LOWPRICE)
                base.Price = LOWPRICE;
            else if (value > HIGHPRICE)
                base.Price = HIGHPRICE;
            else base.Price = value;
        }
    }
}
 
 

[Bryan Cheung]

Compile your code first. Like hype is saying, Book can not be used as a var because its a class name.

And I dont know if this is OK:
"new public double Price"