File being used by another process

[mikes]

Hello,
I am building a c# web app that uses serialization to generate xml
files within a page load event. The page support both creation and
modification events. I do not have a problem with the creation
function. When I resubmit the page to mod the previously created xml
file I get "file xxxx is being used by another process." It appears
that all object have be correctly closed but the XmlTextWriter or the
FileStream objects have not terminated even after being closed.

Code is included below.

Do I need to use a mutex? Or should I set up a watcher to throw an
event on file state change.

Any help appreciated

if(Request.Quer yString["funct"].ToString() == "add")
{
... process form vars.
.. intialize struct
XmlSerializer serializer = new
XmlSerializer(t ypeof(Common.Co mponents.Utilit ies.MinistryCon tent));

FileStream fs = File.OpenWrite( strFileDirector y + strFileName);
XmlTextWriter writer = new XmlTextWriter(f s,
System.Text.Enc oding.UTF8);
writer.Formatti ng = Formatting.Inde nted;

try
{
// perform the XML serialization
serializer.Seri alize(writer, ministryContent );
}
finally
{
// close the writer, which closes the underlying FileStream
//writer.BaseStre am.Close();
writer.Flush();
writer.Close();
fs.Close();
}

try
{
... do some db
}catch(System.e xception ex)
{
.. exhandler
}

}

[mikes]

Fixed.

FileStream fsOpenWrite = new FileStream(m_st rFileDirectory +
strFileName, FileMode.Open,F ileAccess.Write ,FileShare.Writ e);