One way to improve the usability of your application is to
allow personalization—where different users of the same
application have their own set of personalized settings. To
do this, you need a way to store user-specific data, such as
the size of the Window, the background color, etc. And while
some data should be user-specific, some data applies across
the board—things like database connection strings, Web
services URLs, etc.
   You access the settings through the
Properties.Settings.Default class.It's important to
initialize the settings with a default value. If not,
accessing them during runtime will result in errors.