Exception handling allows programmers to deal with unexpected situations that may occur in programs. As an example, consider opening a file using the StreamReader class
in the System.IO namespace. To see what kinds of exceptions this class may throw, you can hover the cursor over the class name in Visual Studio. For instance, you may see the System.IO exceptions FileNotFoundException and DirectoryNotFoundException. If any of those exceptions occurs, the program will terminate with an error message.
using System;
using System.IO;
class ErrorHandling
{
static void Main()
