c# - Weird .Net 4, System.IO.FileNotFoundException when call UserPrincipal.FindByIdentity, -

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i start encounter new runtime system.io.filenotfoundexception exception after upgrade system win7 x64 win 10 x64.

i have following code works perfect until now:

{     principalcontext pc = new principalcontext(contexttype.machine, environment.machinename);     userprincipal usrprin = userprincipal.findbyidentity(pc, identitytype.samaccountname, username);      if (usrprin == null) // no user exist     {         return -1;     }     // user exist      return 1;                      }

i built project using platform target: x86, when run application, exception when call userprincipal.findbyidentity.

a first chance exception of type 'system.io.filenotfoundexception' occurred in system.directoryservices.dll first chance exception of type 'system.io.filenotfoundexception' occurred in system.directoryservices.accountmanagement.dll

all projects compile .net4 , not .net4.5

during debug now, find if change build platform target anycpu, code passed no issue.

it seems os bug! .net 4 x86 not installed or not right!, tried reinstall .net4 couldn't because installed, iran .net cleanup tool well.

any idea why exception?


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