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avoid postback in multiple drodown list using ajax

Posted By:      Posted Date: October 10, 2010    Points: 0   Category :ASP.Net

i have 4 dropdownlist..state,district,place,product..where we have to select the product depend on state ,district ,place and product and there is search button for search particular product where iam using gridview to dipslay particular product deatails . i do not want to do auto past back eventfor page  when i select dropdownlist...i tried using ajax but still i cant get through..i tried this code but,,,,please helpme...how to use ajax for 4 dropdownlist & 1 button so that i can dispaly product deatails.....

<asp:scriptmanager id="ScriptManager1" runat="server">
                    <asp:updatepanel id="UpdatePanel1" runat="server">
                    <asp:label id="Label1" runat="server" stext="STATE:" style="display:inline " mce_style="display:inline ">STATE:</asp:label>
                    <asp:dropdownlist id="DDLSTATE" runat="server" height="18px" style="position :relative; top: 6px; left: 2px;" mce_style="/position :relative; top: 6px; left: 2px;" autopostback="True" datasourceid="SDSSTATE" datatextfield="PUSTA" datavaluefield="P

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