I have a dropdown list that has to update only another dropdown. How do I use UpdatePanel and AutoPostBack to load just the second dropdown list? Can I use UpdatePanel in a way that I dont pass through Page_load() event?

I tryed two solution

<UpdatePanel>
   <dropdownlist1 AutoPostBack = false>
   <dropdownlist2>
<\UpdatePanel>

<dropdownlist1 AutoPostBack = true>
<UpdatePanel>
   <dropdownlist2>
<\UpdatePanel>

both solutions called Page_load()

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