2.5. Summary
You can write C# programs both from the command line and by using the Visual Studio .NET IDE. In its simplest form, a C# application is an EXE file that you create by compiling one or many class files. For the program to execute, you must define an entry point, and a C# EXE file can have only one entry point.
Java programmers should be aware of the following key points.
There is no classpath in C#. All the data required to run the EXE file is defined in the EXE file.
C# allows multiple public classes in one source file.
C# does not require that you give the same name to the class file that you give to the public class in that file.
The Main method of C# must be static (just as in Java).
C# namespaces are roughly equivalent to Java packages, ...
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