The operation has timed out at System.Net.HttpWebRequest.GetResponse() while sending large number of requests to a host

by

ServicePointManager.DefaultConnectionLimit limits the number of outgoing web requests to a given server. The default is generally 2 or 10.

If you are making 50 parallel calls to that web service, you should set ServicePointManager.DefaultConnectionLimit (at app startup) to a larger number (e.g. 40-50).

Additionally, you are not calling Close or Dispose on request. You should do this, or let using take care of it for you.

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