byte[] by = Encoding.Default.GetBytes("000000");
by = new MD5CryptoServiceProvider().ComputeHash(by);
string text1 = "";
for (int num1 = 0; num1 < by.Length; num1++)
{
text1 = text1 + by[num1].ToString("x").PadLeft(2, ‘0‘);
}
原文：http://www.cnblogs.com/myblogslh/p/4164960.html