title: Random String Generator that does not repeat
body: <p>I've been using this random string generator. But my problem is that this random string generator is repeating itself. I've heard of using the shuffle method but I dont know how to implement it in my code. Any help will be mostly appreciated. </p>
  
  <pre><code>private static Random random = new Random();
  public static string RandomString(int length)
  {
      const string chars = "0123456789";
      return new string(Enumerable.Repeat(chars, length)
        .Select(s =&gt; s[random.Next(s.Length)]).ToArray());
  }
  
  public static string RandomString2(int length)
  {
      const string chars = "AB";
      return new string(Enumerable.Repeat(chars, length)
        .Select(s =&gt; s[random.Next(s.Length)]).ToArray());
  }
  </code></pre>
  
  <p>And then in the page load i actually call my 2 methods and combine them in a textbox. </p>
  
  <pre><code>string dummy = RandomString(1);
  string dummy2 = RandomString2(1);
  txtTagNumber.Text = dummy2.ToString() + dummy.ToString();
  </code></pre>