How do I write over an existing file in server.mappath

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Is it possible to write over an existing file in Server.MapPath(file.xml) using:

C#

using (FileStream fsAppend = new FileStream(Server.MapPath("file1.xml"), FileMode.Append, FileAccess.Write))
{
   StreamWriter sw = new StreamWriter(fsAppend);
   ???
}

Or somehow using FileMode.Truncate?? then FileMode.Create?

What I have tried:

FileMode.Append seems the way to go if I figure out the Syntax. I do not want to even try FileMode.Truncate at all.

Posted 1-Apr-17 23:07pm

teledexterus

Updated 1-Apr-17 23:26pm

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OriginalGriff · Answer 1 · 2017-04-01T23:26:00

FileMode.Append always opens the file and if it exists, sets the write position to the end of the stream. So it will never replace the existing file, it just adds to it.
FileMode.Create is the one you want: it replaces an existing file if one exists, or creates a new file if it doesn't.

But ... and it's a big "but ... be careful to use a try...catch block with your code: websites are intrinsically multiuser, and standard FileIO operations which involve writing always lock the file for exclusive access. If the file is in use by another website user, your code will fail.