c# - WebClient vs. HttpClient - Async request -

i have simple webapi method:

[httpget] public ihttpactionresult foo() {     thread.sleep(3000);     return ok("bar"); } 

and have these 2 methods in console application call it:

async task usingwebclient() {     task<string> task = new webclient().downloadstringtaskasync (new uri ("http://localhost.fiddler:63710/api/producttype/foo"));     console.writeline("webclient - before calling wait");     string result = await task;     console.writeline("webclient - after calling wait"); }  async task usinghttpclient() {     task<string> task = new httpclient().getstringasync (new uri ("http://localhost.fiddler:63710/api/producttype/foo"));     console.writeline("httpclient - before calling wait");     string result = await task;     console.writeline("httpclient - after calling wait"); } 

and calling these methods linqpad this:

async task main() {     await usingwebclient();     await usinghttpclient(); } 

i monitoring traffic using fiddler , noticed that:

• when using webclient request web api made , execution continues console.writeline("webclient - before calling wait");
• when using httpclient request web api not made until call await task;

i'm trying understand why request not made when using httpclient. can point me in right direction?

this not duplicate question. i'm not looking reasons choose 1 option on other - i'll use httpclient. know why request created @ later stage when using httpclient.

thanks, david

since both of requests async, none of them should delay execution of current thread (significantly).

it possible, though, 1 of them can send request before current thread reaches next line, while other cannot.

these kinds of timing issues can happen in asynchronous/parallel environments , they're nothing worry long don't separate logically successive operations.