Which event can I catch the following exception from an ASP.NET Drop Down List?

'ddlNames' has a SelectedValue which is invalid because it does not exist in the list of items.
Parameter name: value

[ArgumentOutOfRangeException: 'ddlNames' has a SelectedValue which is invalid because it does not exist in the list of items.
Parameter name: value]

I understand exactly why this is being thrown; I have an ID I am trying to select in the list that does not exist in the list.  I also have code to check for this upon setting the value and preventing the exception.

However, I still would like to handle this exception more gracefully in the future, just in case I do not have the code in place to handle this condition.  To this point I have not been able to find where to 'Catch' this exception.  Can anyone point me to where this could be trapped?

can you show us some code? 

 You catch it at the poing where your ddlNames.SelectedValue =  is being called.

Actually, it does not throw an exception at that point (I debugged and it goes right on through)

Me.ddlNames.SelectedValue = NamesObject.NameID

The above line of code will not throw any exceptions.  It happens after that code... somewhere.

write your code in below if condition and try

if ddlnames.selectedvalue>=0 then

end if

I have code to prevent the exception already as follows:

Dim itemFound As ListItem = ddlNames.Items.FindByValue(NamesObject.NameID)

If (IsNothing(itemFound)) Then

Else

End If

This is not the issue as I expalined in mt original post.  I am trying to determine what event will capture the exception iof for some reason I did not have the code above.  Does anyone know the event where this is thrown to?  It is NOT thrown immedeatly if I only have this line of code:

Me.ddlNames.SelectedValue = NamesObject.NameID

I never found the exact event to catch the exception (unfortunantly); I just placed the code from my previous post in the '_DataBound' event and it works.