Zip folder in C#

This answer changes with .NET 4.5. Creating a zip file becomes incredibly easy. No third-party libraries will be required.

string startPath = @"c:\example\start";
string zipPath = @"c:\example\result.zip";
string extractPath = @"c:\example\extract";

ZipFile.CreateFromDirectory(startPath, zipPath);
ZipFile.ExtractToDirectory(zipPath, extractPath);