The primary function of the using
directive is to make types within a namespace available without qualification to the user code. It considers the set of namespaces and types which are defined in referenced assemblies and the project being compiled.
Take for example the following definition in MyTypes.Dll
namespace MyTypes {
class Class1 {}
}
Now consider referencing MyTypes.dll
from another project with a different namespace. Without a using directive to create Class1
i need to qualify the name
MyTypes.Class1 local1 = new MyTypes.Class1();
The using
directive lets me remove this qualification
using MyTypes;
...
Class1 local1 = new Class1();
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