Xml Serialization doesn't always work

[pagates]

Hi Gurus,

I am having a problem using Xml Serialization - it seems to work only the
second time I try to use it during runtime.

Here's a simplified example (the project is roughly equivalent to folders
and files):

[Serializable]
public class CThingLikeFile
{
private string m_NameProperty;

public CThingLikeFile()
{
m_NameProperty = null;
}

public string NameProperty
{
get { return m_NameProperty; }
set { m_NameProperty = value; }
}
}

[Serializable]
[XmlRootAttribute(IsNullable=false)]
public class CThingLikeFolder
{
private int m_FolderNameProperty;
private CThingLikeFile [] m_TLFiles;

public CThingLikeFolder()
{
m_FolderNameProperty = 0;
m_TLFiles = null;
}

public string FolderNameProperty
{
get { return m_FolderNameProperty; }
set { m_FolderNameProperty = value; }
}

public CThingLikeFile [] TLFiles
{
get { return m_TLFiles; }
set { m_TLFiles = value; }
}
}

[XmlRootAttribute(IsNullable=false)]
public class CThingLikeFileSystem
{
private CThingLikeFolder [] m_TLFolders;

public CThingLikeFileSystem()
{
m_TLFolders = null;
}

public CThingLikeFolderLFiles
{
get { return m_TLFolders; }
set { m_TLFolders = value; }
}
}

And then somewhere....

private void ExportStuff(string FileName)
{
// assume that there is a collection of TLFolders, each of which has TLFiles
CThingLikeFolders [] TheseFolders = GetFolderInfo();

CThingLikeFileSystem TLFileSystem = new CThingLikeFileSystem();
TLFileSystem.TLFolders = TLFolders;

TextWriter tr = new StreamWriter(FileName);
XmlSerializer xs = new XmlSerializer(typeof(CThingLikeFileSystem));
xs.Serialize(tr, TLFileSystem);
tr.Close();
}

On the second time through, and every time thereafter, it correctly will
output the correct XML file. However, on the first run through, the file is
not created, even though I can step through the code and everything looks
correct (the arrays have the correct number of elements, etc.).

Any ideas?

Thanks,
pagates