public class MD5 {
public static string Compute(string _oldstr)
{
UnicodeEncoding enc = new UnicodeEncoding();
MD5CryptoServiceProvider md = new MD5CryptoServiceProvider();
byte[] result = md.ComputeHash(enc.GetBytes(_oldstr));
StringBuilder str = new StringBuilder();
foreach (byte b in result)
{
str.Append(b.ToString("X2"));
}