How to get around the memory leak in the .NET Webbrowser control?

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This leak appears to be a leak in unmanaged memory, so nothing you do in your process is going to reclaim that memory. From your post I can see that you’ve tried avoid the leak quite extensively and without success.

I would suggest a different approach if feasible. Create a separate application that uses web browser control and start it from your application. Use the method described here to embed newly created application within your own existing application. Communicate with that application using WCF or .NET remoting. Restart the child process from time to time to prevent it from taking to much memory.

This of course is quite complicated solution and the restart process could probably look ugly. You might maybe resort to restarting the whole browser application every time user navigates to another page.

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