public static string jiami(string password)    {        byte[] buffer = System.Text.Encoding.UTF8.GetBytes(password);        SHA1CryptoServiceProvider sha = new SHA1CryptoServiceProvider();        byte[] hash = sha.ComputeHash(buffer);        StringBuilder passwordbullder = new StringBuilder(32);        foreach (byte hashByte in hash)        {            passwordbullder.Append(hashByte.ToString("x2"));        }        return passwordbullder.ToString();    }

            FileStream fs = new FileStream(this.fileFullName, FileMode.Open, FileAccess.Read);            SHA1CryptoServiceProvider sha1 = new SHA1CryptoServiceProvider();            Byte[] fileHashes_SHA1 = sha1.ComputeHash(fs);            MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();            Byte[] fileHashes_MD5 = md5.ComputeHash(fs);            //this.fileSize = fs.Length;            //this.sendSize = 0;            fs.Close();            fs.Dispose();