//snimanje podataka
private void SaveData()
{
if (!Directory.Exists(".\\ProgramData"))
{
Directory.CreateDirectory(".\\ProgramData");
}
BinaryWriter bw = new BinaryWriter(new FileStream(".\\ProgramData\\settings.bin", FileMode.Create));
bw.Write(MarginPercent);
bw.Write(LineSpacing);
bw.Write(BookFont);
bw.Write(BookFontSize);
AppTheme.Save(bw);
bw.Close();
}