Send email to user in the ASP.Net GridView Row when the row is updated

protected void GridView1_RowUpdated(object sender, GridViewUpdatedEventArgs e)
    {
        Label2.Text = GridView1.Rows[GridView1.EditIndex].Cells[2].Text.ToString();
        getcustid();
        getmail();
        getDetails();
      mailcust();
    }
    void getmail()
    {
        try
        {
            SqlConnection conn3 = new SqlConnection(conn);
            String q1;
             q1 = "select cCust_Email from cust_details where cCust_ID ='" + Label7.Text + "'";
            SqlCommand cmd = new SqlCommand(q1, conn3);
            conn3.Open();
            SqlDataReader odr1 = cmd.ExecuteReader();
            odr1.Read();
            if (odr1.HasRows)
            {
                MailTextBox.Text = odr1[0].ToString();
            }
        }
        catch (Exception ex)
        {
        }
    }
    void getcustid()
    {
        SqlConnection conn3 = new SqlConnection(conn);
        String q1;
        q1 = "select cCust_ID from orders where cOrder_ID ='" + Convert.ToInt32(Label2.Text) + "'";
        SqlCommand cmd = new SqlCommand(q1, conn3);
        conn3.Open();
        SqlDataReader odr1 = cmd.ExecuteReader();
        odr1.Read();
        if (odr1.HasRows)
        {
            Label7.Text = odr1[0].ToString();
        }
    }
    void mailcust()
    {
        try
        {
            MailMessage mail = new MailMessage();
            mail.To.Add(MailTextBox.Text);
            mail.From = new MailAddress("sender@gmail.com");
            mail.Subject = "Shipping Details";
            mail.Body = Label3.Text + TextBox1.Text + Label4.Text + TextBox2.Text + Label5.Text + TextBox3.Text + Label6.Text + TextBox4.Text;
            mail.IsBodyHtml = true;
            SmtpClient smtp = new SmtpClient();
            smtp.Host = "smtp.gmail.com";
            smtp.Credentials = new System.Net.NetworkCredential("sender@gmail.com", "senderpass");
            smtp.EnableSsl = true;
            smtp.Port = 587;
            smtp.Send(mail);
        }
        catch (Exception ex)
        {
            Response.Write(ex.Message);
        }

    }
    void getDetails()
    {
        try
        {
            SqlConnection conn3 = new SqlConnection(conn);
            String q1;
            q1 = "select * from ordermng where ship_id ='" + Convert.ToInt32(Label2.Text) + "'";
            SqlCommand cmd = new SqlCommand(q1, conn3);
            conn3.Open();
            SqlDataReader odr1 = cmd.ExecuteReader();
            odr1.Read();
            if (odr1.HasRows)
            {
                TextBox1.Text = odr1[0].ToString();
                TextBox2.Text = odr1[1].ToString();
                TextBox3.Text = odr1[2].ToString();
                TextBox4.Text = odr1[3].ToString();
            }
        }
        catch (Exception ex)
        {

        }
    }