(You can read more about static classes and static class members in C# in my previous article here.) Static classes cannot be instantiated or extended. They are abstract and sealed implicitly.

When designing applications, it is important to know when to use an abstract class and when to use an interface. Although abstract classes and interfaces seem similar in some ways, there are key ...

Consider the keywords that decorate class declarations in both languages. Table 1 lists the valid modifier keywords that you can include in a C# "class" statement, or in the matching Visual Basic ...

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