private void createFile(String ruta, String contenido) {
	FileStream fs = new FileStream(ruta, FileMode.Create);
	StreamWriter sw = new StreamWriter(fs);
	sw.Write(contenido);
	sw.Close();
}

private void deleteFile(String ruta) {
	File.Delete(ruta);
}
	
private String readFile(String ruta) {
	FileStream fs = new FileStream(ruta, FileMode.Open);
	StreamReader sr = new StreamReader(fs);
	String s=sr.ReadToEnd();
	sr.Close();
	return s;
}