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copied!<h2>Access modifiers</h2> <blockquote> <p><strong>public</strong></p> <blockquote> <p>The type or member can be accessed by any other code in the same assembly or another assembly that references it.</p> </blockquote> <p><strong>private</strong></p> <blockquote> <p>The type or member can only be accessed by code in the same class or struct.</p> </blockquote> <p><strong>protected</strong></p> <blockquote> <p>The type or member can only be accessed by code in the same class or struct, or in a derived class.</p> </blockquote> <p><strong>internal</strong></p> <blockquote> <p>The type or member can be accessed by any code in the same assembly, but not from another assembly.</p> </blockquote> <p><strong>protected internal</strong></p> <blockquote> <p>The type or member can be accessed by any code in the same assembly, or by any derived class in another assembly. </p> </blockquote> </blockquote> <p>When <strong>no access modifier</strong> is set, a default access modifier is used. So there is always some form of access modifier even if it's not set.</p> <p><strong>Static</strong></p> <blockquote> <p>The static modifier on a class means that the class cannot be instantiated, and that all of its members are static. A static member has one version regardless of how many instances of its enclosing type are created.</p> <p>A static class is basically the same as a non-static class, but there is one difference: a static class cannot be externally instantiated. In other words, you cannot use the new keyword to create a variable of the class type. Because there is no instance variable, you access the members of a static class by using the class name itself.</p> <p>However, there is a such thing as a <a href="http://msdn.microsoft.com/en-us/library/k9x6w0hc%28v=vs.80%29.aspx" rel="noreferrer">static constructor</a>. Any class can have one of these, including static classes. They cannot be called directly & cannot have parameters (other than any type parameters on the class itself). A static constructor is called automatically to initialize the class before the first instance is created or any static members are referenced. Looks like this:</p> </blockquote> <pre><code>static class Foo() { static Foo() { Bar = "fubar"; } public static string Bar { get; set; } } </code></pre> <p>Static classes are often used as services, you can use them like so:</p> <pre><code>MyStaticClass.ServiceMethod(...); </code></pre>

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