//Delete file content and rewrite for books
public void Update_Text_File()
{
if (Lists.Lib.Count > 0)
{
adminCarti.AdaugaCarte(Lists.Lib[0], false);
for (int i = 1; i < Lists.Lib.Count; i++)
{
adminCarti.AdaugaCarte(Lists.Lib[i], true);
}
}
else
{
adminCarti.deleteBooksFile();
}
}