vb.net - Reflection and loading of dlls -

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i trying create generc vb.net import program loading in dlls usings method cant figure out how unload dll once finished . can hangs in memory , of course cant see in task manager nead way close dll after

  public shared function  createinstance(byval plugin availableplugin) object    dim objdll [assembly]     dim objplugin object      try         'load dll         objdll = [assembly].loadfrom(plugin.assemblypath)          'create , return class instance         objplugin = objdll.createinstance(plugin.classname)     catch e exception         return nothing     end try      return objplugin end function


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