c# - insert work item into tfs using tfs api -

i building web page insert tfs work items tfs using tfs api.

i using credentials connect tfs server.

each time creates tfs work item using tfs web page, creates work item under name ,since 1 connected tfs server. there way can create work item user logged web application , created work item ?

i have access users name not users password

protected void formview1_iteminserting(object sender, formviewinserteventargs e)         {         uri url = new uri("url");              networkcredential nc = new networkcredential();              tfsteamprojectcollection coll = new tfsteamprojectcollection(url, nc);              coll.ensureauthenticated();              workitemstore workitemstore = coll.getservice<workitemstore>();             project teamproject = workitemstore.projects["abc"];             workitemtype workitemtype = teamproject.workitemtypes["issue"];              workitem wi = new workitem(workitemtype);              wi.title = ((textbox)formview1.findcontrol("txttasktitle")).text;                 wi.save();          } 

can please tell me can have name of person logged application 1 created tfs work item ?

i tried following :

       uri url = new uri("url");          var collection = tfsteamprojectcollectionfactory.getteamprojectcollection(url);         var workitemstore = new workitemstore(collection, workitemstoreflags.bypassrules);          project teamproject = workitemstore.projects["abc"];         workitemtype workitemtype = teamproject.workitemtypes["issue"];          workitem wi = new workitem(workitemtype);          string s = "name";         wi.fields["system.createdby"].value = s;          wi.title = "test item";         wi.save(); 

try this:

tfsteamprojectcollection coll = new tfsteamprojectcollection(url,credentialcache.defaultcredentials);

get rid of whole network credential thing.