c# - New Thread inside a Thread in WinRT -

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i performing functionality in threadpool. inside thread, linq query executed. takes more time because, in query selects collection of class has bool property checked 2 collection. 

collection.select(item => new myelement { isactive = this.checkisactive(collection1, collection2, item), value = item, name = item != null ? item.tostring() : "empty" }).tolist<myelement>();

checkisactive method----

private bool checkisactive(list<object> collection1, list<object> collection2, object item){  if (collection1.contains(item) && !collection2.contains(item))      return false;  return true;}

can optimized? idea?

can use new thread above execution in new thread?

can use thread or await return type method?


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