Reload graph on onchange dropdownlist

I have a page with a graph who got its data from a xml data source. I also have a dropdownlist that filter out the xml result after a postback. I want this filtering being done without a postback (querystring)... as I understand I can perform this with ajax? Some help are welcome.. :-)
Who is Participating?
Rahul Goel ITILConnect With a Mentor Senior Consultant - DeloitteCommented:
You can use UpdatePanel and AsyncPostBack to the dropdownlist Item Changed.
and you can refresh the graph accordingly
dingirAuthor Commented:
hmm ok.. u have some code or pseudocode of how to make the dropdown-postback update the updatepanels graph with the new values? the graph loads it's data through a xml data stream (webservicexml.aspx (yes a webform))

thank's in advanced,
dingirAuthor Commented:
please also some idea describing the use of ajax() instead of updatepanel!
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