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encrypt and decrypt md5 hash text

Posted By:      Posted Date: September 27, 2010    Points: 0   Category :ASP.Net

i am encrypting textbox value in md5 using this coding and passing as querystring , and on other page i want to decrypt.....

so plz tell how can i do this..

System.Security.Cryptography.MD5CryptoServiceProvider x = new System.Security.Cryptography.MD5CryptoServiceProvider();
        byte[] bs = System.Text.Encoding.UTF8.GetBytes(TextBox1.Text);
        bs = x.ComputeHash(bs);
        System.Text.StringBuilder s = new System.Text.StringBuilder();
        foreach (byte b in bs)
        string password = s.ToString();

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