Hi,Every One. I Already Made Xml File For Storing Multiply Record But Not I Want To Edit Any Record How Can I Do Plz .Here Is My Code For Xml

private void btnCreatexml_Click(object sender, EventArgs e)
        {
            XmlTextWriter xwriter = new XmlTextWriter("Employee.Xml",   Encoding.UTF8);
            xwriter.Formatting = Formatting.Indented;
            xwriter.WriteStartElement("Employees");
            xwriter.WriteStartElement("EmpInformation");
            xwriter.WriteStartElement("name");
            xwriter.WriteString(textBox1.Text);
            xwriter.WriteEndElement();
            xwriter.WriteStartElement("age");
            xwriter.WriteValue(textBox2.Text);
            xwriter.WriteEndElement();
            xwriter.WriteStartElement("email");
            xwriter.WriteString(textBox3.Text);
            xwriter.WriteEndElement();
            xwriter.WriteEndElement();
            xwriter.WriteEndElement();
            xwriter.Close();
        }

private void btnAddrecord_Click(object sender, EventArgs e)
        {
            XmlDataDocument doc = new XmlDataDocument();
            doc.Load("Employee.Xml");

            XmlNode EmpInformation = doc.CreateElement("EmpInformation");
            XmlNode name = doc.CreateElement("name");
            name.InnerText = textBox1.Text.Trim();
            EmpInformation.AppendChild(name);
            XmlNode age = doc.CreateElement("age");
            age.InnerText = textBox2.Text.Trim();
            EmpInformation.AppendChild(age);
            XmlNode email = doc.CreateElement("email");
            email.InnerText = textBox3.Text.Trim();
            EmpInformation.AppendChild(email);
            doc.DocumentElement.AppendChild(EmpInformation);
            doc.Save("Employee.Xml");
        }