several concept in c#

program,types,members,namespace,and assembly

program is consist of source files51Testing软件测试网1`(|]"Tv5L)AC

source files could contain types(such as classes and interfaces)which may have some members such as property,methods,fields,and events.

types can be orgnized under the namespaces.51Testing软件测试网nD7f&Saf/j-W&f

when the program is compiled it is in an assembly(such as .exe or .dll)