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 != \"\")
{
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Answer 1

Instead of writing out the XML manually, I would consider using the XmlSerializer along with a generic List. It looks like your needs are simple so memory usage isn't much of a concern. To add an item you will have to load the list and write it out again.

void Main()
{
    var contacts = new List 
    { 
        {new Contact { FirstName = "Bob", LastName = "Dole" }},
        {new Contact { FirstName = "Bill", LastName = "Clinton" }}
    };

    XmlSerializer serializer = new XmlSerializer(typeof(List));
    TextWriter textWriter = new StreamWriter(@"contacts.xml");
    serializer.Serialize(textWriter, contacts);
    textWriter.Close(); 
}

public class Contact
{
    public string FirstName { get; set; }
    public string MiddleName { get; set; }
    public string LastName { get; set; }
}