How to insert SessionID into table using asp.net?

Question

i want to insert Session ID of user into table ,

if (Session["EmpID"] == null)
           {
               Response.Redirect("LogingForm.aspx");
           }

here is my insert Button code

protected void tbsv_Click(object sender, EventArgs e)
       {


           {

               {

                   if (ddlBbitem.SelectedValue == "")
                   {
                       Response.Write("<script>alert('Please Select Item Name')</script>");

                   }
                   else
                       if (prdbqty.Text == "")
                       {
                           Response.Write("<script>alert('Please Input Weight')</script>");

                       }


                       else
                       {
                           con.Open();
                           SqlCommand cmd = new SqlCommand("spInsertbigbale", con);
                           cmd.CommandType = CommandType.StoredProcedure;
                           // cmd.Parameters.AddWithValue("@RollNo", TextBox4.Text.Trim());
                           cmd.Parameters.AddWithValue("@Codeitem", ddlBbitem.SelectedValue);


                           cmd.Parameters.AddWithValue("@Bweight", prdbqty.Text.Trim());
                           cmd.Parameters.AddWithValue("@Bpqty", opbbqty.Text.Trim());

                           cmd.Parameters.AddWithValue("@CID", DDLBBCID.SelectedValue);
                           cmd.Parameters.AddWithValue("@SecID", DDLBBsec.SelectedValue);


                           cmd.Parameters.AddWithValue("@EntryDate", txtbpentrydate.Text);
                           cmd.Parameters.Add("@BID", SqlDbType.Int);
                           cmd.Parameters["@BID"].Direction = ParameterDirection.Output;







                           cmd.ExecuteNonQuery();

                           int ResultValue = Convert.ToInt32(cmd.Parameters["@BID"].Value);

                           if (ResultValue > 1)
                           {

                               Response.Redirect("BigBalePrintView.aspx?BID=" + ResultValue + "");
                           }
                           else
                           {
                               Response.Write("<script>alert('Record Not save')</script>");


                           }
                           con.Close();




                       }
               }
           }