using System;
   
class MainClass {
    public static void Main() {
        try {
            checked {
                int Integer1;
                int Integer2;
                int Sum;
   
                Integer1 = 2000000000;
                Integer2 = 2000000000;
                Sum = Integer1 + Integer2;
            }
        } catch(OverflowException) {
            Console.WriteLine("A mathematical operation caused an overflow.");
        }
    }
}
           
          

   

using System;
   
class MainClass
{
    public static void Main()
    {
        try
        {
            int [] IntegerArray = new int [5];
   
            IntegerArray[10] = 123;
   
            // wait for user to acknowledge the results
            Console.WriteLine("Hit Enter to terminate...");
            Console.Read();
        }
        catch(IndexOutOfRangeException)
        {
            Console.WriteLine("An invalid element index access was attempted.");
        }
    }
}
           
          

   

using System;
   
class MainClass
{
    public static void Main()
    {
        try
        {
            MainClass       MyObject = new MainClass();
            IFormattable    Formattable;
   
            Formattable = (IFormattable)MyObject;
   
            // wait for user to acknowledge the results
            Console.WriteLine("Hit Enter to terminate...");
            Console.Read();
        }
        catch(InvalidCastException)
        {
            Console.WriteLine("MyObject does not implement the IFormattable interface.");
        }
    }
}
           
          

   

using System;
   
class MyClass {
    public int Value;
}
   
class MainClass
{
    public static void Main()
    {
        try
        {
            MyClass MyObject = new MyClass();
            MyObject = null;
   
            MyObject.Value = 123;
   
            // wait for user to acknowledge the results
            Console.WriteLine("Hit Enter to terminate...");
            Console.Read();
        }
        catch(NullReferenceException)
        {
            Console.WriteLine("Cannot reference a null object.");
   
            // wait for user to acknowledge the results
            Console.Read();
        }
    }
}

           
          

   





using System;
   
class MainClass
{
    public static void Main()
    {
        try
        {
            Recursive();
        }
        catch(StackOverflowException)
        {
            Console.WriteLine("The CLR is out of stack space.");
        }
    }
   
    public static void Recursive()
    {
        Recursive();
    }
}
           
          

   





using System;
   
class MainClass
{
    public static void Main()
    {
        int [] LargeArray;
   
        try
        {
            LargeArray = new int [2000000000];
        }
        catch(OutOfMemoryException)
        {
            Console.WriteLine("The CLR is out of memory.");
        }
    }
}
           
          

   


using System.IO;

public class IoError {
  public static void Main() {
    StreamReader f;
    try{
      f = new StreamReader("DoesNotExist.data");
    }catch(IOException e) {
      System.Console.WriteLine(e);
    }
    f = new StreamReader("DoesNotExist.data");
  }
}