C# Checked Statement

In this chapter you will learn:

• What is the checked statement in C#?
• What is the benefit of using checked statement in C#?
• How to use checked statement in C# programming?

The checked statements force C# to raise exception whenever underflow or stack overflow exception occurs due to integral type arithmetic or conversion issues.

Example

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Checked_Statement
{
    class Program
    {
        static void Main(string[] args)
        {
            int num;
            // assign maximum value
            num = int.MaxValue;
            try
            {
                checked
                {
                    // forces stack overflow exception
                    num = num + 1;
                    Console.WriteLine(num);
                }
            }
            catch (Exception e)
            {
                Console.WriteLine(e.ToString());
            }
            Console.ReadLine();
        }
    }
}

This program raises exception while executing because it is using checked statement that prevent the current execution when stack overflow exception appears.

Output

System.OverflowException: Arithmetic operation resulted in an overflow.
at Checked_Statements.Program.Main<String[] args> in C:Documents and Settings\Steven\My Documents\Visual Studio 2008\Projects\complete c# code\Chapter4\Checked Statements\Checked Statements\Program.cs:line 18
__

Summary

In this chapter you learned what checked statement is and also learned how to use checked statement in C sharp programming. In next chapter you will learn about Unchecked Statement in C#.