Add new xml elements to the file selected using OpenDialog

private void button2_Click(object sender, EventArgs e) { SaveFileDialog sd = new SaveFileDialog(); using (sd) { if (sd.ShowDialog() == System.Windows.Forms.DialogResult.OK) { XmlDocument document = new XmlDocument(); XmlElement root = document.CreateElement("mainroot"); document.AppendChild(root); XmlElement name = document.CreateElement("Name"); name.InnerText = textBox1.Text; document.DocumentElement.AppendChild(name); root.AppendChild(name); document.Save(sd.FileName);