private void button1_Click(object sender, EventArgs e)
{
if (this.openFileDialog1.ShowDialog() == DialogResult.OK)
{
this.tbCerPath.Text = openFileDialog1.FileName;
X509Certificate2 cer = CryptUtils.getPublicKeyXmlFromCer(openFileDialog1.FileName);
XmlDocument xmldoc = new XmlDocument();
xmldoc.LoadXml(cer.PublicKey.Key.ToXmlString(false));
XmlNode node = xmldoc.SelectNodes("//Modulus")[0];
this.tbPublicN.Text = CryptUtils.hex2asc(CryptUtils.Base64Decoder(node.FirstChild.Value));
}
}