c# 4.0 - Async calls in c# -

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when execute code developed call async method of linq2twitter, getting system.aggregate exception, code below:

static async task<list<mytwitterstatus>> getretweets(ulong tweetid, twittercontext twitterctx)         {     list<mytwitterstatus> retweets = new list<mytwitterstatus>();      var publictweets =         await         (from tweet in twitterctx.status          tweet.type == statustype.retweets &&                tweet.id == tweetid          select tweet)          .tolistasync();      if (publictweets != null)         publictweets.foreach(tweet =>         {             if (tweet != null && tweet.user != null)             {                 mytwitterstatus tempstatus = new mytwitterstatus();                 tempstatus.country = tweet.place.country;                 tempstatus.createdat = tweet.createdat;                 tempstatus.favoritecount = long.parse(tweet.favoritecount.tostring());                 tempstatus.id = tweet.id;                 tempstatus.istruncated = tweet.truncated;                 tempstatus.lang = tweet.lang;                 tempstatus.maxid = tweet.maxid;                 tempstatus.placefullname = tweet.place.fullname;                 tempstatus.retweetcount = tweet.retweetcount;                 tempstatus.screenname = tweet.screenname;                 tempstatus.text = tweet.text;                 tempstatus.userfriends = tweet.user.friendscount;                 tempstatus.usercreated = tweet.user.createdat;                 tempstatus.userfollowers = tweet.user.followerscount;                 tempstatus.userfavorities = tweet.user.favoritescount;                 tempstatus.userfriends = tweet.user.friendscount;                 tempstatus.userlocation = tweet.user.location;                 tempstatus.username = tweet.user.name;                 tempstatus.usertweetcount = tweet.user.statusescount;                 retweets.add(tempstatus);             }         });         return retweets;         }

the issue when called method

var authorizer = new singleuserauthorizer {     credentialstore = new inmemorycredentialstore     {         consumerkey = sm.default.consumer_key2.tostring(),         consumersecret = sm.default.consumer_secret2.tostring(),         oauthtoken = sm.default.access_token2.tostring(),         oauthtokensecret = sm.default.access_secret2.tostring()     } }; twittercontext twitterctx = new twittercontext(authorizer);  task<list<mytwitterstatus>> task = task<list<mytwitterstatus>>.factory.startnew(() => getretweets(ulong.parse(tweet.stringid), twitterctx).result); task.wait();                     list<mytwitterstatus> templist = task.result.tolist<mytwitterstatus>();  foreach (var ret in templist) {     un = file.removespecialcharacters(ret.username);     sn = file.removespecialcharacters(ret.screenname);      tweets.appendline(account + "," + getwe(ret.createdat) + "," + text + "," + un + "," + sn + "," + ret.createdat + "," +     file.removespecialcharacters(ret.userlocation) + ",,,1,," + ret.usertweetcount + "," +     ret.retweetcount + "," + ret.favoritecount + "," + ret.userfollowers);

i appreciate kind of assistance it, have no idea how solve it.

can add try/catch see inner exception is.

try {     //perform operation here } catch (aggregateexception aex) {     //dive inner exception }

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