Web (ASP.NET), C# สอบถามการ Insert ข้อมูลจาก Dropdownlist ลง Databse ครับ

<asp:DropDownList ID="txtCustomerID" runat="server">
                    <asp:ListItem Value="AAA1Data">AAA1</asp:ListItem>
                    <asp:ListItem Value="AAA2Data">AAA2</asp:ListItem>
</asp:DropDownList></td>

protected void FormView1_InsertCommand(object sender, FormViewInsertEventArgs e)
        {
            string cusId = (FormView1.Row.FindControl("txtCustomerID") as DropDownList).Text;
            string comName = (FormView1.Row.FindControl("txtCompanyName") as TextBox).Text;
            string conName = (FormView1.Row.FindControl("txtContactName") as TextBox).Text;

            myConn.Open();
            strSQL = "INSERT INTO Customers(CustomerID, CompanyName, ContactName)";
            strSQL += " VALUES(@cusId, @comName, @conName)";
            SqlCommand myComm = new SqlCommand(strSQL, myConn);
            myComm.Parameters.Add("@cusId", SqlDbType.VarBinary).Value = cusId;
            myComm.Parameters.Add("@comName", SqlDbType.VarChar).Value = comName;
            myComm.Parameters.Add("@conName", SqlDbType.VarChar).Value = conName;
            myComm.ExecuteNonQuery();
            myConn.Close();

            FormView1.ChangeMode(FormViewMode.ReadOnly);
            ShowData();
        }