saving data in arrays with c#..how ? ...

So, here you have the array and a list. The difference is you can't resize array in runtime (you can do this with list).

 //Writed by Paul Ignasiak
 //C#
 
 List<Transform> listOfTransforms = new List<Transform>();
 Transform[] arrayOfTransforms;

If you want to add something to array or list, just write

 //Writted by Paul Ignasiak
 
 Transform myTransform;
 
 void myMethod()
 {
  listOfTransforms.Add(myTransform);
  //or
  arrayOfTransforms[index] = myTransform;
  //index is value thats specificates what "place" we should assign myTransform to.
 }

If you want to read the position:

 Vector3 pos;
 
 void myMethod()
 {
 pos = listOfTransforms[index].position;
 //or
 pos = arrayOfTransforms[index].position;
 }

So, if you mean saving to file, you have to use the System.IO library. This is an example how you can use it to save names of Transforms from array.

 using UnityEngine;
     using System.Collections;
     using System.IO;
     
     public Transform[] myTransforms;
     
     void saveAll()
     {
      StreamWriter sw = new StreamWriter(@"C:\tmp\text.txt");
      foreach(Transform t in myTransforms)
      {
       sw.WriteLine("" + t.name);
      }
      sw.Close();
     }

Of cource you can modify it to your preferences, and change C:\tmp\text.txt to what you want but you have to be warned of writing file in directory that no exists. To prevent that, use this code:

     if(!Directory.Exists(@"directory"))
     {
     Directory.CreateDirectory(@"directory");
     }
 
 //The '@' symbol before the string is used to gain posibility of use "\" in string.

If you want to read them, use following code:

 Transform[] myTransforms;
 
 void loadAll()
 {
 StreamReader sr = new StreamReader(@"C:\tmp\text.txt")
 
  for(int i = 0; i < myTransforms.Lenght; i++)
  {
   myTransforms[i].name = sr.ReadLine();
  }
 }

Hope that helps

Paul