c# - ASP.Net MVC 4 I need to Delay execution -

i have asp.net mvc 4 application periodically calls external api information (resource). resource has rate limiter account (meaning other apps use same pool , may hit limit). when limit hit, send http status code 429 header of "retry-after" in seconds (lets 25 seconds).

if app gets response, need delay execution 25 seconds , retry. first off, let me method code running under asp.net 4.5 async method. this, thinking using system.threading.thread.sleep(25000) now, don't use this, there better way of doing this?

i have apologize open ended question, couldn't find on proper way of delay execution (while keeping things async , making sure don't run out of threads)

update: following code better delay?

  await task.run(() => thread.sleep(10000)) 

you shouldn't use thread.sleep because blocks thread amount of time server less scalable. should instead use task.delay waits asynchronously without blocking thread:

await task.delay(10000) 

task.delay uses timer internally accomplish that. more info: thread.sleep vs task.delay?