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Asked: 2026-05-11T00:43:30+00:00

Imagine that I will make an async call in .NET, i.e. HttpWebRequest.BeginGetResponse, and the

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Imagine that I will make an async call in .NET, i.e. HttpWebRequest.BeginGetResponse, and the HttpWebRequest object isn’t referenced at a broader scope. Will the Garbage Collector destroy it and cause problems?

Example code:

using System; using System.Net;  public class AsyncHttpWebRequest {     void Main()     {         var Request = HttpWebRequest.Create('http://www.contoso.com');         var result = Request.BeginGetResponse(GetResponseCallback, null);     }      private void GetResponseCallback(IAsyncResult AsyncResult)     {         // Do Something..     } }

Alternate version (with the request being passed as an AsyncState):

using System; using System.Net;  public class AsyncHttpWebRequest {     void Main()     {         var Request = HttpWebRequest.Create('http://www.contoso.com');         var result = Request.BeginGetResponse(GetResponseCallback, Request);     }      private void GetResponseCallback(IAsyncResult AsyncResult)     {         // Do Something..     } }
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1 Answer

  1. An object is considered alive and non-eligible for garbage collection if any live thread contains a reference to it, or if it’s referenced statically (directly or indirectly in both cases).

    In both examples the async API keeps a reference to your request (within the thread pool where async IO operations are lodged) and so it won’t be garbage collected until it completes.

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