Writing XML to a file without overwriting previous data

Question

I currently have a C# program that writes data to an XML file in using the .NET Framework.

if (textBox1.Text!=\"\" && textBox2.Text != \"\")
{
    X         


        

Answer 1

You could use a XDocument:

public static void Append(string filename, string firstName)
{
    var contact = new XElement("contact", new XElement("firstName", firstName));
    var doc = new XDocument();

    if (File.Exists(filename))
    {
        doc = XDocument.Load(filename);
        doc.Element("contacts").Add(contact);
    }
    else
    {
        doc = new XDocument(new XElement("contacts", contact));
    }
    doc.Save(filename);
}

and then use like this:

if (textBox1.Text != "" && textBox2.Text != "")
{
    Append(textXMLFile.Text, textBox1.Text);
}
else
{
    MessageBox.Show("Nope, fill that textfield!");
}

This will create/append the contact to the following XML structure:

  
    Foo
  
  
    Bar