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try
{
    FileInfo fi = new FileInfo(filename);
    if (!this.texturen.ContainsKey(fi.Name)) {
        CSTTexture tex = new CSTTexture();
        BinaryFormatter binF = new BinaryFormatter();
        FileStream fs = new FileStream(filename, FileMode.Open);

        tex = (CSTTexture)binF.Deserialize(fs);

        this.texturen.Add(fi.Name, tex);
        fs.Flush();
        fs.Close();
    }

    return true;
}
catch (Exception e)
{
    MessageBox.Show(e.ToString(), "fehler");
    return false;
}