title: XML serialize without overwriting
body: <p>How can I serialize data to xml without overwriting previous data?
  In this code I am able to make XML file but when I run this again I overwrite what I saved previously:</p>
  
  <pre><code>using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Text;
  using System.Threading.Tasks;
  using System.IO;
  using System.Xml.Serialization;
  
  namespace ActorGenerator
  {
     class Program
     {
        static void Main()
        {                  
          Console.Write("How many actors you want to add? ");
          int max = 0;
          max = int.Parse(Console.ReadLine());
  
          for (int i = 0; i &lt; max; i++)
          {
              int x = i + 1;
              Console.WriteLine("////////////////////////ACTOR" + x + "/////////////////////////////////");
  
  
              Actor actor1 = new Actor();
              Console.Write("NAME (string): ");  actor1.Name = Console.ReadLine();
              Console.Write("AGE (int): "); actor1.Age = int.Parse(Console.ReadLine());
              Console.Write("FOCUS (string): "); actor1.Focus = Console.ReadLine();
              Console.Write("PRICE (int): "); actor1.Price = int.Parse(Console.ReadLine());
              Console.Write("CONTRACTED (true/false): "); actor1.Contracted = bool.Parse(Console.ReadLine());
              Console.Write("PLAYING IN FILM (true/false): "); actor1.PlayingInFilm = bool.Parse(Console.ReadLine());
              Console.Write("SKILL (int): "); actor1.Skill = int.Parse(Console.ReadLine());
  
  
              SerializeToXML(actor1);
          }
      }
  
      static public void SerializeToXML(Actor actor)
      {
          XmlSerializer serializer = new XmlSerializer(typeof(Actor));
          TextWriter textWriter = new StreamWriter(@"c:\users\Desktop\actor.xml");
          serializer.Serialize(textWriter, actor);
          textWriter.Close();
      }
  }
  
  public class Actor
   {
      public string Name { get; set; }
      public int Age { get; set; }
      public string Focus { get; set; }
      public int Price { get; set; }
      public bool Contracted { get; set; }
      public bool PlayingInFilm { get; set; }
      public int Skill { get; set; }
   }
  }
  </code></pre>
  
  <p>Also, how can I read XML data and store it into variable?</p>