send automated reply ?

 protected void btnResetPassword_Click(object sender, EventArgs e)

    {

        SqlConnection con = new SqlConnection("Your Connection String");

        con.Open();

        SqlCommand comm = new SqlCommand("select * from userDetail where email='" + txtMail.Text + "'", con);

        DataTable dt = new DataTable();

        SqlDataAdapter da = new SqlDataAdapter(comm);

        da.Fill(dt);

        if (dt.Rows.Count > 0)

        {

            // Reset the password bu Updating the Password Field in Database

            //Build Random Password for User to Send it in Mail

            Random r = new Random();

            string newPasword = "";

            for (int i = 0; i <= 5; i++)

            {

                newPasword += r.Next(65, 90);

            }

            comm = new SqlCommand("update UserDetails set password='" + newPasword + "' where email='" + txtMail.Text + "'", con);

            comm.ExecuteNonQuery();

            con.Close();

            // Now Send the New password to user By

            //Code to Send mail Hope you know the code to send mail

        else

        {

            //Warn user that Email Not found In Database

            Response.Write("Email Not found In Database!!");

        }

    }