C-Sharp (C#) Group: Serialisation fails, but without any errors being thrown.

I have a bizarre situation in which serialisation is failing
routinely
under a specific condition, and I'm wondering if the
details ring a
bell with anyone here.

I have 2 classes that my application serialises before
closing down.
One of these classes contains a string field which contains
a path to a
file. This is populated from the contents of a text box,
which in turn
is populated using an OpenFileFialog object.

Under normal usage, the 2 classes always fail to be
serialised.
However, if a path is manually typed into the text box
mentioned above,
serialisation works. At the point of serialisation, I've
checked that
the field corresponding to the file path is the same,
regardless of how
the path was entered into the text box (typed or using an
OpenFileDialog object).

This is absolute madness - why should the fact that an
OpenFileDialog
box has been used at some point in the application's
lifetime mean
that serialisation fails?

Stepping through the serialisation (done using the
BinaryFormatter), I
can't see any obvious problems and certainly no errors are
being
thrown.

I'm confident that the OpenFileDialog object is relevant to
the
problem as whether it is used or not is the sole user action
that
defines whether serialisation works or not.

For what its worth, I use  different BinaryFormatter objects
for
serialising the two classes (they are local to the  method
they are
used in).

Please spare me from insanity!

Greg


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