Limiting the number of Asynchronous WebClient requests

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  13 years ago

  by mike50874

  Mike Holman

  , United Kingdom

  Joined 13 years ago

  Hi everyone.

  I'm working on a roject which downloads a large number of files from the web using the WebClient class in VB.NET. I'm using its OpenReadAsync method to download the files on different threads for better performance. The problem is the performance is too good - the program is using all 25 threads in the threadpool to download the files at once which is too many simultaneous requests from one IP for some servers to tolerate.

  What I need to do is limit the number of simultaneous requests to 5 or 6. I have tried setting a counter for each active request and sleeping the main thread until the count comes back below the limit but have found that the main thread never awakens.

  Does anyone have any ideas?

  Cheers,

  Mike

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  13 years ago

  by frankkerrigan

  Frank Kerrigan

  , United Kingdom

  Joined 13 years ago
  You could use Application Start/End , Session Start / End to limit and monitor user connections and limit their user.  You can also limit connections via IIS.
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