Serialization/Deserialization Problems

Hi, I am new to Unity and I have reached a point where I need to save some data in my game. What I want to do is to save the data in a .txt file using a Save class I made myself and then be able to read it and transfer it to an array of Saves.

Here is my Saving script which is working:

 #pragma strict
  import System.Collections.Generic;
  import System.Runtime.Serialization.Formatters.Binary;
  import System.Runtime.Serialization;
  import System.IO;
  
  public class Save  {
     var mode:int;
     var range:int;
     var max_combo: int;
     var points:int;
  }
      var bf = new BinaryFormatter();
      
      var cur_save: Save;
     var saves:Save[]=new Save[10];
     static var isOver:boolean;
     static var isSaved:boolean;
     private var f:FileStream;
     
 function Start () {
     f= FileStream("C:/Savegames/game1.txt",FileMode.Append,FileAccess.Write);
     isOver=false;
     isSaved=false;
     saves=new Save[10];
     f.Flush();
     f.Close();
 
     
 }
 function GetSave(){
     cur_save.mode=Play1_control.choosen_Op;
     cur_save.range=Play1_control.choosen_Range;
     cur_save.points=Game_control.Points;
 }
 
 function Update () {
     GetSave();
     var i:int;
     
     
     var ms : MemoryStream;
     
     if(isOver && !isSaved){
             
                 f= FileStream("C:/Savegames/game1.txt",FileMode.Append,FileAccess.Write);
                 ms=new MemoryStream();
                 saves[i]=new Save();
                 saves[i]=cur_save;
                 i++;
                 
                 bf.Serialize(ms, cur_save);
                 ms.WriteTo(f);
                 
                 f.Flush();
                     f.Close();
                 Debug.Log(saves[0].points);
                 isSaved=true;
             
 
             
     }
 
 
     
 }

And here is my Loading script which doesn't work:

 #pragma strict
  import System.Collections.Generic;
  import System.Runtime.Serialization.Formatters.Binary;
  import System.Runtime.Serialization;
  import System.IO;
  import System.Linq;
  import System.Text;
  var bf = new BinaryFormatter();
  var isLoaded:boolean;
  var s:String;
       
 function Start () {
     isLoaded=false;
     s=File.ReadAllText("C:/Savegames/game1.txt");
     Debug.Log(s);
 }
 
 function Update () {
     var ms : MemoryStream= new MemoryStream();
     var w : StreamWriter = new StreamWriter(ms);
     w.Write(s);
     w.Flush();
     ms.Position = 0;
     
     var saves:Save[]=bf.Deserialize(ms);
     
 }

I am also getting an error with the loading script on line 25, it says :

SerializationException: Invalid binary format

Any help with the Loading script would be appreciated.