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The using keyword must be before any declarations ad and definitions within a namespace
Within the csharp_app_struture namespace there are now two Person classes available. When you run this program it will print the value 33. The C# compiler resolves to the last seen definition. So the Person definition at line 14 overrides that seen in line 5.
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It’s normal practice to organise your namespaces into separate files or within the same file as shown in the example above |