How can I send an "application form" entered by the user to a specific email using ASP.NET C#?

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Data;

namespace PrintersInkWebApplication
{
    public partial class Orders : System.Web.UI.Page
    {
        SqlConnection con = new SqlConnection
        ("server=HLCLITBIRRISH\\MSSQLSERVERAYB ;Initial Catalog=PrintersInk;
        User ID=asdfs;Password=2342453");

        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                //mangment
                SqlCommand cmd_mang = new SqlCommand
                ("Select Mangment_Name from Employee_Data", con);

                SqlDataAdapter da = new SqlDataAdapter(cmd_mang);

                DataSet ds = new DataSet();
                da.Fill(ds);
                drpdl_mang.DataTextField = 
                     ds.Tables[0].Columns["Mangment_Name"].ToString();
                drpdl_mang.DataSource = ds.Tables[0];
                drpdl_mang.DataBind();

                //department
                SqlCommand cmd_dep = new SqlCommand
                           ("Select L_nam3 from Employee_Data", con);

                SqlDataAdapter dad = new SqlDataAdapter(cmd_dep);

                DataSet dsd = new DataSet();
                dad.Fill(dsd);
                drpdl_dep.DataTextField = 
                      dsd.Tables[0].Columns["L_nam3"].ToString();
                drpdl_dep.DataSource = dsd.Tables[0];
                drpdl_dep.DataBind();

                //unit
                SqlCommand cmd_unt = new SqlCommand
                           ("Select L_nam4 from Employee_Data", con);

                SqlDataAdapter dau = new SqlDataAdapter(cmd_unt);

                DataSet dsu = new DataSet();
                dau.Fill(dsu);
                drpdl_unt.DataTextField = 
                      dsu.Tables[0].Columns["L_nam4"].ToString();
                drpdl_unt.DataSource = dsu.Tables[0];
                drpdl_unt.DataBind();

                //printertype
                SqlCommand cmd_pt1 = new SqlCommand
                   ("Select O_PrinterName from Printers_Table", con);

                SqlDataAdapter dp1 = new SqlDataAdapter(cmd_pt1);

                DataSet dsp1 = new DataSet();
                dp1.Fill(dsp1);
                drpdl_pt1.DataTextField = 
                  dsp1.Tables[0].Columns["O_PrinterName"].ToString();
                drpdl_pt1.DataSource = dsp1.Tables[0];
                drpdl_pt1.DataBind();

                SqlCommand cmd_pt2 = new SqlCommand
                   ("Select O_PrinterName from Printers_Table", con);

                SqlDataAdapter dp2 = new SqlDataAdapter(cmd_pt1);

                DataSet dsp2 = new DataSet();
                dp2.Fill(dsp2);
                drpdl_pt2.DataTextField = 
                  dsp2.Tables[0].Columns["O_PrinterName"].ToString();
                drpdl_pt2.DataSource = dsp2.Tables[0];
                drpdl_pt2.DataBind();

                SqlCommand cmd_pt3 = new SqlCommand
                   ("Select O_PrinterName from Printers_Table", con);

                SqlDataAdapter dp3 = new SqlDataAdapter(cmd_pt3);

                DataSet dsp3 = new DataSet();
                dp3.Fill(dsp3);
                drpdl_pt3.DataTextField = 
                  dsp3.Tables[0].Columns["O_PrinterName"].ToString();
                drpdl_pt3.DataSource = dsp3.Tables[0];
                drpdl_pt3.DataBind();

                SqlCommand cmd_pt4 = new SqlCommand
                   ("Select O_PrinterName from Printers_Table", con);

                SqlDataAdapter dp4 = new SqlDataAdapter(cmd_pt4);

                DataSet dsp4 = new DataSet();
                dp4.Fill(dsp4);
                drpdl_pt4.DataTextField = 
                  dsp4.Tables[0].Columns["O_PrinterName"].ToString();
                drpdl_pt4.DataSource = dsp4.Tables[0];
                drpdl_pt4.DataBind();

                SqlCommand cmd_pt5 = new SqlCommand
                   ("Select O_PrinterName from Printers_Table", con);

                SqlDataAdapter dp5 = new SqlDataAdapter(cmd_pt5);

                DataSet dsp5 = new DataSet();
                dp5.Fill(dsp5);
                drpdl_pt5.DataTextField = 
                  dsp5.Tables[0].Columns["O_PrinterName"].ToString();
                drpdl_pt5.DataSource = dsp5.Tables[0];
                drpdl_pt5.DataBind();
            }
        }

        protected void imgbtn_save_Click(object sender, ImageClickEventArgs e)
        {
            string cbx = "";
            string cbx2 = "";
            if (cb_printer.Checked) cbx += "طابعة";
              else 
             cbx += null;
            if (cb_ink.Checked) cbx2 += "حبر";
            else
                cbx2 += null;
//()

            //string rbl=
            string sql = "insert into Oreders_Table 
            values(@empname,@odate,@mang,@dep,@unt,@pcheck,
                   @purpose,@pcolor,@numpaper,@icheck,@pt1,@pt2,@pt3,
                   @pt4,@pt5,@nw1,@nw2,@nw3,@nw4,@nw5)";
            SqlCommand cmn_add_order = new SqlCommand(sql, con);

            cmn_add_order.Parameters.AddWithValue("@empname", txt_empname.Text);
            cmn_add_order.Parameters.AddWithValue("@odate", txt_date.Text);
            cmn_add_order.Parameters.AddWithValue
                          ("@mang", drpdl_mang.SelectedValue);
            cmn_add_order.Parameters.AddWithValue
                          ("@dep", drpdl_dep.SelectedValue);
            cmn_add_order.Parameters.AddWithValue
                          ("@unt", drpdl_unt.SelectedValue);
            cmn_add_order.Parameters.AddWithValue("@pcheck", cbx);
            cmn_add_order.Parameters.AddWithValue
                          ("@purpose", txt_purpose.Text);
            cmn_add_order.Parameters.AddWithValue
                  ("@pcolor", rbl_pcolor.SelectedItem.Text);
            cmn_add_order.Parameters.AddWithValue
                          ("@numpaper", txt_numpaper.Text);
            cmn_add_order.Parameters.AddWithValue("@icheck", cbx2);
            cmn_add_order.Parameters.AddWithValue
                          ("@pt1", drpdl_pt1.SelectedValue);
            cmn_add_order.Parameters.AddWithValue
                          ("@pt2", drpdl_pt2.SelectedValue);
            cmn_add_order.Parameters.AddWithValue
                          ("@pt3", drpdl_pt3.SelectedValue);
            cmn_add_order.Parameters.AddWithValue
                          ("@pt4", drpdl_pt4.SelectedValue);
            cmn_add_order.Parameters.AddWithValue
                          ("@pt5", drpdl_pt5.SelectedValue);
            cmn_add_order.Parameters.AddWithValue("@nw1", txt_nw1.Text);
            cmn_add_order.Parameters.AddWithValue("@nw2", txt_nw2.Text);
            cmn_add_order.Parameters.AddWithValue("@nw3", txt_nw3.Text);
            cmn_add_order.Parameters.AddWithValue("@nw4", txt_nw4.Text);
            cmn_add_order.Parameters.AddWithValue("@nw5", txt_nw5.Text);

            con.Open();
            cmn_add_order.ExecuteNonQuery();
            con.Close();
            lbl_message.Text = "done";
        }
    }
}