System.OutOfMemoryException on file download

have an ashx handler with the following code. The idea is to hide the path of the file and prompt a download

       context.Response.AddHeader("Content-Disposition", "attachment; filename=" + fileName);
       context.Response.AddHeader("Content-Length", file.Length.ToString());
       context.Response.ContentType = "application/octet-stream";

This works fine for some files however on others i get

Exception of type 'System.OutOfMemoryException' was thrown. Should wrap the whole thing in a using statement. What should it implement?
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Is this consistent exception ? i mean do you get this exception all the times in a consistent way ?

I have encountered suck exception few times, after restarting the visual studio, the exception was gone ...
If it doesn't help, please talk to me ...
Look here about WriteFile / TransmitFile and try to use last one;jsessionid=HPRVJYNZGLXPBQE1GHPSKHWATMY32JVN

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