This example calls the ToInt32(String)

This example calls the ToInt32(String) method to convert an input string to an int . The program catches the two most common exceptions that can be thrown by this method, FormatException and OverflowException. If the number can be incremented without overflowing the integer storage location, the program adds 1 to the result and prints the output

static void Main(string[] args)
{
    int numVal = -1;
    bool repeat = true;

    while (repeat == true)
    {
        Console.WriteLine("Enter a number between −2,147,483,648 and +2,147,483,647 (inclusive).");

        string input = Console.ReadLine();

        // ToInt32 can throw FormatException or OverflowException. 
        try
        {
            numVal = Convert.ToInt32(input);
        }
        catch (FormatException e)
        {
            Console.WriteLine("Input string is not a sequence of digits.");
        }
        catch (OverflowException e)
        {
            Console.WriteLine("The number cannot fit in an Int32.");
        }
        finally
        {
            if (numVal < Int32.MaxValue)
            {
                Console.WriteLine("The new value is {0}", numVal + 1);
            }
            else
            {
                Console.WriteLine("numVal cannot be incremented beyond its current value");
            }
        }
        Console.WriteLine("Go again? Y/N");
        string go = Console.ReadLine();
        if (go == "Y" || go == "y")
        {
            repeat = true;
        }
        else
        {
            repeat = false;
        }
    }
    // Keep the console open in debug mode.
    Console.WriteLine("Press any key to exit.");
    Console.ReadKey();    
}
// Sample Output: 
// Enter a number between -2,147,483,648 and +2,147,483,647 (inclusive). 
// 473 
// The new value is 474 
// Go again? Y/N 
// y 
// Enter a number between -2,147,483,648 and +2,147,483,647 (inclusive). 
// 2147483647 
// numVal cannot be incremented beyond its current value 
// Go again? Y/N 
// Y 
// Enter a number between -2,147,483,648 and +2,147,483,647 (inclusive). 
// -1000 
// The new value is -999 
// Go again? Y/N 
// n 
// Press any key to exit.