File being used by a nother processor HTML file as attachement create file on the fly

I would like to generate a HTML File on the fly "Without the need to save it any where" as an email attachment, unfortunately I did not find away to do it that way , so I have used string builder to concatenate the HTML then I am saving that file to a folder on my app, then I attach the file from that folder to an email.

The problem is when I recreate the file then try to attach the same file I get the message that the file is being used by another processor.

appreciate your help in advance !
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Fernando SotoRetiredCommented:

When you are creating the file are you wrapping the File operations in a using block? If not try doing so, something like the following.

string fileName = "test.txt";

using (StreamWriter writer = new StreamWriter(fileName, true))
    // Your file operations here
    //  ....

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UKITAuthor Commented:
I do indeed wrap it in using statement, the two things i have missed
1-is the "true" parameter which is why it is not closed.
2-i was giving the full path i.e. server.mappath...
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