IOException While Trying to Delete a Folder?!

Make sure you don't step on your own toes. The following code illustrates...

using System;
using System.IO;

internal class Program
{
    private static void Main(string[] args)
    {
        string directory = @"C:\atemporaryfolder\";
        Directory.CreateDirectory(directory);
        Environment.CurrentDirectory = directory;
        Directory.Delete(directory);
    }
}

Who's using the folder? You are. Whenever Environment.CurrentDirectory is set in an application, it prevents anything else from deleting the folder. Note that the Environment.CurrentDirectory can also be set through a variety of other means, including the FolderBrowserDialog, OpenFileDialog and SaveFileDialog.

What's the solution? Simple. Set Environment.CurrentDirectory to something else. @"C:\" works just fine.