Retrieve and assign data from a .txt file?

If I understand your question properly, you should be able to use System.IO for reading and writing to files. Below is an example on how to read and write the values the file and store the values in a List.

 //READING A FILE
 
 
     public List<string> texttoread = new List<string>(); //Where the values from the text file will be stored
 
     public void Read()
     {
         string curline; //current line
         System.IO.StreamReader file = new System.IO.StreamReader(PATH TO FILE);
         while((curline = file.ReadLine()) != null)
         {
             texttoread.Add(curline);
         }
     }
 
         
         //SAVING TO FILE
         public List<string> texttowrite = new List<string>(); //The values that will be saved into the file
     
         public void Write()
     {
         System.IO.StreamWriter file2 = new System.IO.StreamWriter(PATH_TO_WRITE);
         foreach(string i in texttowrite)
         {
             file2.Write(i.ToString());
         }
         file2.Close();
     }