how to add XElement in specific location in XML Document

I want to create an XML document like this:

I want to create it from scratch using code and LINQ-to-XML. In the form Load Event I've written this code:

private void Form9_Load(object sender, EventArgs e)
{
    doc = new XDocument(new XDeclaration("1.0", "utf-8", "yes"));
    XElement myroot = new XElement("Employees");
    doc.Add(myroot);
}

How I can add new person to Employees, and if I want to insert person in specific location what can I do?

How I can delete or update a specific person ?