RandomString

public static class StringHelper
{
 public static string RandomString( int length )
 {
 Random random = new Random((int) DateTime.Now.Ticks);
 StringBuilder sb = new StringBuilder();

 string validChars = "abcdefghijklmnopqrstuvwxyz0123456789";
 char c;
 for ( int i = 0; i < length; i++ )
 {
 c = validChars[random.Next(0, validChars.Length)];
 sb.Append(c);
 }

 return sb.ToString();
 }
}

StringHelper.RandomString(16)