MD5

public class Md5
{
public static String MD5Encrypt(String str)
{
MD5 md5 = new MD5CryptoServiceProvider();
byte[] result = md5.ComputeHash(System.Text.Encoding.Default.GetBytes(str));
StringBuilder sb = new StringBuilder(32);  
for (int i = 0; i < result.Length; i++)
{
sb.Append( result[i].ToString("x2"));
}
return sb.ToString();// BitConverter.ToString(result).Replace("-", "");
 
}
}