Writing german characters in a file

[Martin]

Hi all,

I've made an application for Windows Mobile 5.0, .Net framework 3.5.
This app reads and writes sequential files, with the streamreader and
writer.
My problem is that some of the files contain (german) names. They may
contain some special characters, such as a e o with points on top of them.
One input file is created in another programming platform, and there the
names contain these characters in correct format. When I display such a
string in the VB app, it also schows correct. However, when I write it in
another sequential file, with the streamwriter, the geman characters get
replaced by squares.
Does anyone know how I can preserve the original characters?

Thanks,
Martin