Decrypt encrypted password in database and send forgot password email in ASP.Net

Hi,

I am using the below post to encrypt and decrypt the password.

ENCRYPT POST

Now my code is working for Encryption. But now what I want is,

When I am using Forgot passwprd functionality, I want to send the decrypted password to the respective user in the Email.

In my database table the password is saved in the Encrypted format.

I have the code decrypt code from the above mentioned post, the question is where to place in the below code so that it will decrypt it properly

Here is my code:-

protected void btnSubmit_Click(object sender, EventArgs e)
        {
            DataSet ds = new DataSet();
            using (SqlConnection conn = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["DefaultCSRConnection"].ConnectionString))
            {
                conn.Open();
                SqlCommand cmd = new SqlCommand("SELECT username,password FROM tbl_User Where email= '" + txtEmail.Text.Trim() + "'", conn);
                SqlDataAdapter da = new SqlDataAdapter(cmd);
                da.Fill(ds);
                conn.Close();
                if (ds.Tables[0].Rows.Count > 0)
                {
                    MailMessage Msg = new MailMessage();
                    // Sender e-mail address.
                    Msg.From = new MailAddress(txtEmail.Text);
                    // Recipient e-mail address.
                    Msg.To.Add(txtEmail.Text);
                    Msg.Subject = "Password Details";
                    Msg.Body = "Hi, <br/>Please check your Login Details<br/><br/>Your Username is: " + ds.Tables[0].Rows[0]["username"] + "<br/><br/>Your Password is: " + ds.Tables[0].Rows[0]["password"] + "<br/><br/>";
                    Msg.IsBodyHtml = true;
                    // your remote SMTP server IP.
                    SmtpClient smtp = new SmtpClient();
                    smtp.Host = "smtp.gmail.com";
                    smtp.Port = 587;
                    smtp.Credentials = new System.Net.NetworkCredential("test@test.com", "**********");
                    smtp.EnableSsl = true;
                    smtp.Send(Msg);
                    Msg = null;
                    //lbltxt.Text = "Your Password Details Sent to your mail";
                    ScriptManager.RegisterStartupScript(this, this.GetType(), "alert", "alert('Your Password Details Sent to your mail');window.location ='Login.aspx';", true);
                    // Clear the textbox valuess
                    txtEmail.Text = "";
                }
                else
                {
                    Response.Write("<script>alert('Email Id you entered does not exist');</script>");
                }
            }
        }
		
		// Decrypt code
		
		private string Decrypt(string cipherText)
{
    string EncryptionKey = "MAKV2SPBNI99212";
    byte[] cipherBytes = Convert.FromBase64String(cipherText);
    using (Aes encryptor = Aes.Create())
    {
        Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(EncryptionKey, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
        encryptor.Key = pdb.GetBytes(32);
        encryptor.IV = pdb.GetBytes(16);
        using (MemoryStream ms = new MemoryStream())
        {
            using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateDecryptor(), CryptoStreamMode.Write))
            {
                cs.Write(cipherBytes, 0, cipherBytes.Length);
                cs.Close();
            }
            cipherText = Encoding.Unicode.GetString(ms.ToArray());
        }
    }
    return cipherText;
}

Please help