c# - ThreadAbortException when Task calls method in service reference -

i need call method in service reference name canceltransactionbyrefpos. method has following signature:

int canceltransactionbyrefpos(long refpos, out string resultdescription); 

if method returns '0' cancel succeeded. if method returns value, method has called again.

i have written cancel method calls canceltransactionbyrefpos. important call happens asynchronous because can take 30 seconds till response given.

my method looks like:

public void cancel(long refpos, giftcard giftcard, account_3_2 account)     {        var task =  task.factory.startnew(() =>         {             int result;                         {                 string resultdescription;                 result = _client.canceltransactionbyrefpos(refpos, out resultdescription);                 // logic log result giftcard , account parameter             } while (result != 0);         });         // task.wait(); // ######## uncomment -> code executes! ########      } 

when cancel task.wait() part in comment, threadabortexception.

when uncomment task.wait() , execute again, doing if have wait until task executed, there no use calling method asynchronous.

edit

i have configurated service reference allows generation of asynchronous operations. same problem.