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Simplest namespace with class definition

A namespace is declared using the namespace keyword. The general form of namespace is shown here: namespace name {     // members     } using System; namespace HelloWorld {   /// <summary>   /// Summary description for Class1.   /// </summary>   class Class1   {     /// <summary>     /// The main entry point for the application.     /// </summary>     [STAThread]     static void Main(string[] args)     {       System.Console.WriteLine( "Hello world from C#" );      }   } } Hello world from C#