c# - Stacking namespaces can't be referenced just like any other element? -

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So here's a snippet I have made where one namespace (inside the BA) is inside the other. Generally when you use 'space'; You can access all the elements without typing SpaceA. This is the case for class A, but I can not see Spaceby without typing Space space B. Why is it like this? Here's the code: 

  using the system; Using SPACE; Namespace space {class A (public A) {console. Weedline ("A"); }} Namespace spacebase {public square b {public b () {console. Vitiline ("B"); }}}} Namespace test CSARP {class program {static zero main (string [] arg) {// it does not spacesby B. B x = new space b. B (); // This works SpaceA.SpaceB.B y = New SpaceA.SpaceB.B (); Usually when you use space; 'You can access all the elements without typing the space.   
 Only  direct  types which are members of  SpaceA  a  name-place-or-type-name  Never using a normal  director, using a namespace is not solved, and then another "nicknamepace" is used on the name. Note that it has nothing to do with how it has been declared (in the case of the nested namespace declaration or just  Namespace space. Spacebie ) - another example would be: 
 < Pre> using  system; ... Xml.Linq.XElement x = faucet; // Invalid

See Section 3.8 of the C # 5 specification for exact details of the name resolution.

An minor difference is when you have to use the nicknames for a namespace, at that point to see other namespaces Can be used for 

  x = system. Xml; ... X.Linq.XElement x = faucet; // valid

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