C#(Generate Random String)

private static string GeneratePassword()

        {

            Random rd = new Random(DateTime.Now.Millisecond);

            string allowedCharsAll = "abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNOPQRSTUVWXYZ0123456789";

            string allowedCharsUpper = "ABCDEFGHJKLMNOPQRSTUVWXYZ";

            string allowedCharsNum = "0123456789";

            int passwordLength = rd.Next(8, 8);

            char[] chars = new char[passwordLength];

            chars[0] = allowedCharsUpper[rd.Next(0, allowedCharsUpper.Length)];

            chars[1] = allowedCharsNum[rd.Next(0, allowedCharsNum.Length)];

            for (int i = 2; i < passwordLength; i++)

            {

                chars[i] = allowedCharsAll[rd.Next(0, allowedCharsAll.Length)];

            }

            return new string(chars);

        }