c# - The name "xx" does not exist in the current context -

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my program keeps getting error "the name "ok" not exist in current context." doing wrong?

namespace game {     class program     {         static bool selftest()         {             bool ok = gamemodel.selftest();              if (ok)                 system.diagnostics.debug.writeline("succeded");             else                  system.diagnostics.debug.writeline("failed");              return ok;         }          static void main(string[] args)         {             bool ok = selftest();         }     } }  namespace game {     class gamemodel     {         public static bool selftest()         {             ok = true;              return ok;         }     } }

change

public static bool selftest() {     ok = true;      return ok; }

to

public static bool selftest() {     bool ok = true;     return ok; }

or perhaps just

public static bool selftest() {     return true; }

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