Generate Unique ID in C#.NET

Just a demo example as below :

private string GenerateRandomCode()
  {
    string s = "";
    Random objrand = new Random();
    char[] arr = "abcdefghijklmnopqrstuvwxyz".ToCharArray();
    for (int i = 0; i < 3; i++)
    {
      s = s + arr[objrand.Next(26)].ToString() + objrand.Next(10).ToString();
    }
    return s;
  }

You can modify it as you want