private void btnIngresar_Click(object sender, RoutedEventArgs e)
{
Stream stm = File.OpenRead(fileName);
byte[] binaryImage = new byte[stm.Length];
stm.Read(binaryImage, 0, (int)stm.Length);
string msg = u.insertarImagen(4, binaryImage);
MessageBox.Show(msg, "Aviso");
}