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Maintaining state when using user control dynamic property
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Curtis Swartzentruber
Little background for clarity. We have a retail
site selling music product. We will related
a particular title in various ways to content

For instance:

this title relates to this feature
this title is a recommended pick

These relationships are in simple tables such as
TitleID, FeatureID
TitleID, GenreID

There are others as well.

So I often in my data entry backend have the need
to lookup a title either by key (TitleID) or
description (Title) and then put it in one of these
tables. Seemed like a natural place for a user
control.

I exposed a public property where I can pass the
pertinent insert logic from the calling page, since
all the other logic is the same regardless. This
property maps to a private string in the user control.

I can pass in the insert string, but it loses it again
after the first postback. So I put an invisible label
in the user control and set the text property to this
string in my property SET. This is working okay.

Question, is there anything wrong with this approach?
Did I miss something obvious? I haven't been playing
around with user controls for very long. Also, what
is the reason the user control loses the value after
postback. I assume I am expecting state maintenance
when there is none there, is that right?

Curtis
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Doug Seven (VIP)

There is nothing wrong with this approach. Another option is to put the
value in ViewState (if ViewState is enabled).

ViewState.Add ("ItemName", "ItemValue" );

Then you can grab it whenever you need it:

(String) ViewState["ItemName"];

The user control is losing its state for one of a couple possible reasons:

<%@ Page EnableViewState="False" %>
This will disable ViewState, and the user control state will not be retained
across requests.
or
The user control is ddynamically loaded on each request, whihc means it is a
new object on each request, losing all state.
______________________________________________
doug seven | sr. developer | dotnetjunkies.com

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