error codes and exceptions in c# asp.net mvc code example

Example 1: exception in asp.net c#

class Program
{
    static void Main(string[] args)
    {
        try
        {
            Console.WriteLine("Enter a number: ");

            var num = int.parse(Console.ReadLine());

            Console.WriteLine($"Squre of {num} is {num * num}");
        }
        catch(Exception ex)
        {
            Console.Write("Error info:" + ex.Message);
        }
        finally
        {
            Console.Write("Re-try with a different number.");
        }
    }
}

Example 2: exception in asp.net c#

static void Main(string[] args)
{
    FileInfo file = null;

    try
    {
        Console.Write("Enter a file name to write: ");
        string fileName = Console.ReadLine();
        file = new FileInfo(fileName);
        file.AppendText("Hello World!")
    }
    catch(Exception ex)
    {
        Console.WriteLine("Error occurred: {0}", ex.Message );
    }
    finally
    {
        // clean up file object here;
        file = null;
    }
}