Everything works fine, HOWEVER, any postback logic that fires does NOT see
the newly added items.
The interesting thing is that all of the changes I made in the textboxes
of knowledge of ASP.
Is there a way to FORCE ASP to "see" the newly added items?
Thanks in advance.
The state of the listbox, as ASP.NET knows it, is in the veiwstate hidden
field on the form. When you add an entry in the listbox through client side
scripting the state in the viewstate hidden field for the listbox is not
changed. The next time the form is submitted to the server, the server reconstructs
the listbox contents from the viewstate field. This is why your addition
is not there.
In this situation you could do one of two things:
1) Do a postback to the server when adding the entry to the listbox. This
is the intended webform model. The postback is more efficient than most
think, but I'd only recommend it for intranet apps, or if your audience is
2) Retrieve the values added by the client scripting by using the Request
object. It's still there and works mostly the same as it did in previous
versions. You could then add it to the listbox control on the server if
I think the postback route was MS's intention as the easiest route to take,
but the reality is that it's not the most efficient way for Internet apps
to accomplish that set of functionality.
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