title: When I try to write to a List my Previous text in there gets Overwritten
body: <p>(The Books class is defined outside of this code.) So when I try to Read a book from this file I get only this one book. And every time I add a new one the old one gets over written. So I cannot add a new book to my myLibraryBooks List Because it gets overwritten automatically.</p>
  
  <pre><code>Books book = new Books();
  
  Console.Write("Enter Author Name:");
  book.Author = Console.ReadLine();
  
  Console.Write("Enter Book Title:");
  book.Title = Console.ReadLine();
  
  Console.Write("Enter Book ISBN:");
  book.ISBN = Console.ReadLine();
  
  Console.Write("Enter the Publish Date:");
  book.Publish_Date = Console.ReadLine();
  
  myLibraryBooks.Add(new Books() { Author = book.Author.ToUpper(), Title = book.Title.ToUpper(), ISBN = book.ISBN, Publish_Date = book.Publish_Date.ToUpper() });
  Console.WriteLine("Book added Successfully");
  sw.Write(book.Author, FILE_PATH);
  sw.Write("\r\n", FILE_PATH);
  sw.Write(book.Title.ToUpper(), FILE_PATH);
  sw.Write("\r\n", FILE_PATH);
  sw.Write(book.ISBN.ToUpper(), FILE_PATH);
  sw.Write("\r\n", FILE_PATH);
  sw.Write(book.Publish_Date.ToUpper(), FILE_PATH);
  sw.Write("\r\n", FILE_PATH);
  sw.WriteLine(book.Author, FILE_PATH);
  sw.Close();
  </code></pre>