How can I persist the state of a DropDownList control

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Greetings,
I"m develop a custom control (render). It inherits a ListControl.
In the Render method, I apply an ArrayList to the DataSource property and
call the DataBind method.
So, how can I get the SelectIndexChanged event?
In other words, how can I know when the user change the dropdownlist
selected item, after all, in the LoadPostData method the postcollection came
null every time.

Thanks.

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Thanks.
I resolve with a ViewState field.

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