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    <p>As others have stated, you can use AppSettings to store simple data. The basics are easy; going beyond them is hard (see <a href="http://devlicio.us/blogs/derik_whittaker/archive/2006/11/13/app-config-and-custom-configuration-sections.aspx" rel="nofollow noreferrer">App.Config and Custom Configuration Sections</a>). You can also serialize classes to XML or <a href="http://www.codeplex.com/Json" rel="nofollow noreferrer">JSON</a>, write custom storage formats, use databases, etc.</p> <p>Making the configuration available throughout your application is a separate issue. Static classes and Singletons are inherently difficult to <a href="http://en.wikipedia.org/wiki/Unit_testing" rel="nofollow noreferrer">test</a>, and introduce <a href="http://en.wikipedia.org/wiki/Coupling_%28computer_science%29" rel="nofollow noreferrer">coupling</a> throughout your other classes. One option is to create an interface for your configuration data class, create and load the configuration on startup, then pass the <strong>interface</strong> to any class that needs it (often as a constructor parameter). This is called <a href="http://en.wikipedia.org/wiki/Dependency_injection" rel="nofollow noreferrer">Dependency Injection</a>.</p> <p>If you're doing this a lot, there are libraries that will make it easier (after you get past the learning curve). See <a href="http://www.hanselman.com/blog/ListOfNETDependencyInjectionContainersIOC.aspx" rel="nofollow noreferrer">List of .NET Dependency Injection Containers (IOC)</a>.</p>
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    1. POGlobal variable approach in C# Windows Forms application? (is public static class GlobalData the best)
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    1. COthanks - what do you mean exactly by "then pass the interface"? I like your suggestion of some decoupling but not going the hold hog to a full dependency injection framework (which would be overkill).
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      1. USGreg
    2. CO@Greg: So your Foo class needs to access a configuration parameter. Load or Main creates the MyCustomConfig class and calls its Load method (or however you have it defined). MyCustomConfig implements interface IMyCustomConfig, which exposes all the properties. Your Foo class would then have a constructor of Foo(IMyCustomConfig config). If Load/Main creates Foo, it passes its instance of MyCustomConfig to it. If Foo creates Bar and Bar needs a config, Foo passes its config to Bar's constructor and so on. If you have a lot of levels, then consider a DI framework.
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