Generating Random Passwords

Guid.NewGuid().ToString("d").Substring(1,8)

public string CreatePassword(int length)
        {
            string valid = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";
            string res = "";
            Random rnd = new Random();
            while (0 < length--)
                res += valid[rnd.Next(valid.Length)];
            return res;
        }

string[] words = { 'bur', 'ler', 'meh', 'ree' };
string word = "";

Random rnd = new Random();
for (i = 0; i < 3; i++)
   word += words[rnd.Next(words.length)]

int numbCount = rnd.Next(4);
for (i = 0; i < numbCount; i++)
  word += (2 + rnd.Next(7)).ToString();

return word;

string password = Guid.NewGuid().ToString().ToLower()
                      .Replace("-", "").Replace("l", "").Replace("1", "").Replace("o", "").Replace("0","")
                      .Substring(0,10);