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When you use the System.Net.HttpWebRequest and the System.Net.HttpWebResponse classes in an application that uses a thread pool, you may receive the following error message:
System.InvalidOperationException: There were not enough free threads in the ThreadPool object to complete the operation
The System.Net.HttpWebRequest and the System.Net.HttpWebResponse classes always use asynchronous methods to complete a request. When the asynchronous request is made, ASP.NET uses a new thread from the ThreadPool object. When ASP.NET does not find a thread, the System.Net.HttpWebRequest class returns the error message instead of queuing the request.
To work around this problem, use one of the following methods:
For more information, visit the following Microsoft Web sites:
Programming the Thread Pool in the .NET Framework
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