สอบถามเรื่อง insert ข้อมูลจาก dropdownlist ลงดาต้าเบส

 protected void btnSubmit_Click(object sender, EventArgs e)
        {
            //*** Open Connection ***'
            strConnString = "Server=.\\SQLEXPRESS;UID=sa;PASSWORD=1105;database=Status;Max Pool Size=400;Connect Timeout=600;";
            objConn = new SqlConnection();
            objConn.ConnectionString = strConnString;
            objConn.Open();

            int intCount = 0;

            //*** Check Username exists ***'
            strSQL = new StringBuilder();
            strSQL.Append(" SELECT COUNT(*) FROM [User] ");
            strSQL.Append(" WHERE Username = @sUsername ");
            objCmd = new SqlCommand(strSQL.ToString(), objConn);
            objCmd.Parameters.Add("@sUsername", SqlDbType.VarChar).Value = txtUsername.Text;
            intCount = (int)objCmd.ExecuteScalar();

            if (intCount >= 1)
            {
                pnlFinishUser.Visible = true;
                lblStatus.ForeColor = Color.Red;
                lblStatus.Text = "This username already exist";
                return;
            }

            //*** Insert New User ***'
            strSQL = new StringBuilder();
            strSQL.Append("insert into [User]");
            strSQL.Append("(Firstname,Lastname,Username,OrgID)");
            strSQL.Append("values");
            strSQL.Append("(@sFirstname,@sLastname,@sUsername,@sOrgID)");
            objCmd = new SqlCommand(strSQL.ToString(), objConn);


            //***Insert ค่าจาก Textbox กับ dropdown ลง Parameter ที่ Declare มาจาก strSQL***'
            objCmd.Parameters.Add("@sFirstname", SqlDbType.NVarChar).Value = txtFirstname.Text;
            objCmd.Parameters.Add("@sLastname", SqlDbType.NVarChar).Value = txtLastname.Text;
            objCmd.Parameters.Add("@sUsername", SqlDbType.NVarChar).Value = txtUsername.Text;
            objCmd.Parameters.Add("@sOrgID", SqlDbType.Int).Value = ddlOrganization.SelectedItem.Value;

            objCmd.ExecuteNonQuery();

            objConn.Close();
            objConn = null;

            pnlFinishUser.Visible = true;
            try
            {
                lblStatus.ForeColor = Color.GreenYellow;
                lblStatus.Text = "You successfully added new user!";
                pnlAddUser.Visible = false;

            }
            catch (Exception ex)
            {
                lblStatus.ForeColor = Color.Red;
                lblStatus.Text = "Cant insert user!(" + ex.Message + ")";
            }
        }