asp.net - Shared/Static variable in Global.asax isolated per request? -

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i have asp.net web services share common helper class need instantiate 1 instance of per server. it's used simple translation of data, spend time during start-up loading things web.config file, etc. the helper class 100% thread-safe. think of simple library of utility calls. i'd make methods shared on class, want load initial configuration web.config. we've deployed web services iis 6.0 , using application pool, web garden of 15 workers.

i declared helper class private shared variable in global.asax, , added lazy load shared readonly property this:

private shared _helper myhelperclass  public shared readonly property helper() myhelperclass             if _helper nothing             _helper = new myhelperclass()         end if         return _helper     end end property

i have logging code in constructor myhelperclass(), , shows constructor running each request, on same thread. i'm sure i'm missing key detail of asp.net msdn hasn't been helpful.

i've tried doing similar things using both application("helper") , cache("helper") , still saw constructor run each request.

it's not wise use application state unless absolutely require it, things simpler if stick using per-request objects. addition of state helper classes cause sorts of subtle errors. use httpcontext.current items collection , intialise per request. vb module want, must sure not make stateful.


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