what is namespace in c sharp error

wpf C getting started cefsharp.tutorial 个人更喜欢这个cef的.net

threading;namespacemycsharp{classprogram{publicstaticvoidcallto

$using system;namespace s5_9{public class student{public string$

using system;namespace s5_9{public class student{public string

像我这种英语烂的,public/private都要从头开始背.

threading.tasks; namespace csharpprimenumber

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