Replicate nullreference exception in textbox after clicking Add button

Question

I am trying to replicate NullReferenceException in textbox after clicking Add button.

Is there a way or a tool to use so that once I am in the page, I will change the textbox ID so it will throw a NullReferenceException?

I have tried to use developertools to change the textbox id while I am on the page before clicking add button but it still recognizes the original textbox id so it doesn't throw the error.

I want to replicate the issue using the front-end only, without changing the code, in the functional tester's perspective. Appreciate your help thanks

<div id="divSalesContent" runat="server" style="overflow: scroll;
width: 1017px; height: 680px; padding: 2px">
          <table border="0" cellpadding="0" cellspacing="0" width="500">
               <td colspan="5" style="border-left: .5px; border-left-style: solid; border-right: 2px; border-right-style: solid; border-color:

                  <telerik:RadTextBox ID="OrderName" 
                        runat="server" 
                        Width="50px" 
                        Skin="Simple" 
                        Font-Bold="true" 
                        Font-Names="Verdana" 
                        Font-Size="11px" 
                        ForeColor="#22222"
                        BackColor="#CFFDFF"
                        MaxLength="30">
                  </telerik:RadTextBox>         
                  <asp:DropDownList ID="ddlTypes" 
                        runat="server"
                        BackColor="#CCCDFF"
                        Font-Names="Verdana" 
                        Font-Bold="true"
                        Font-Size="10px">
                  </asp:DropDownList>
               </td>            </table>        </div>
             <div id="divSubmitting" runat="server" style="padding-left: 3px; padding-top: 6px; width: 800px; text-align: justify">
          <br /><br />
          <asp:Button ID="btnAddNewOrder" 
              runat="server" 
              Text="Submit" 
              OnClick="btnAddNewOrder_click" />
          <span style="padding-left: 189px">
          </span>
</div>

Answer 1

Yes at any line of your use, do this

throw NullReferenceException

this would throw the exception.

http://msdn.microsoft.com/en-us/library/1ah5wsex.aspx