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This is a feature of C# 9.0. Similar to in scripting languages, top-level statements removes the ceremony of having to declare the Program class with a Main method. Instead, statements can be written directly in one specific file, and that file will be the entry point of the program. Code in other files will still have to be defined in classes.
A C# namespace provides the same level of code isolation as a Java package or a C++ namespace, with very similar rules and features to a package. Namespaces can be imported with the "using" syntax. Namespaces can be imported with the "using" syntax.
Although namespaces are used extensively in recent C++ code, most older code does not use this facility because it did not exist in early versions of the language. For example, the entire C++ Standard Library is defined within namespace std , but before standardization many components were originally in the global namespace.
C# naming conventions generally follow the guidelines published by Microsoft for all .NET languages [21] (see the .NET section, below), but no conventions are enforced by the C# compiler. The Microsoft guidelines recommend the exclusive use of only PascalCase and camelCase , with the latter used only for method parameter names and method-local ...
C# Definition In Java, the enumeration type is a class, and its values are objects (instances) of that class. The only valid values are the ones listed in the enumeration. The enumeration type may declare fields, allowing each individual enumerated value to reference additional data associated uniquely with that specific value.
But it can span over several namespaces. Also, one namespace can spread over several assemblies. In large designs, an assembly may consist of multiple files that are held together by a manifest (i.e. a table of contents). In C#, an assembly is the smallest deployment unit used, and is a component in .NET. In Java, it is a JAR file. [1]
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In object oriented programming, objects provide a layer which can be used to separate internal from external code and implement abstraction and encapsulation. External code can only use an object by calling a specific instance method with a certain set of input parameters, reading an instance variable, or writing to an instance variable.