handling full page Postback on asp.net webpage

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hello everyone, i am still having a full page postback after using an updatepanel on asp.net webpage, does anyone know what might be the cause? here is my code:

XML

<asp:UpdatePanel ID="UpdatePanel1" runat="server">
   <ContentTemplate>
    <asp:DropDownList ID="DropDownList2" runat="server" AutoPostBack="True"
                    style="z-index: 1; left: 548px; top: 366px; position: absolute">
                    <asp:ListItem>---Select---</asp:ListItem>
                    <asp:ListItem>True</asp:ListItem>
                    <asp:ListItem>False</asp:ListItem>
                </asp:DropDownList>

 </ContentTemplate>
 </asp:UpdatePanel>

Posted 4-Aug-13 12:52pm

Uwakpeter

Updated 4-Aug-13 13:15pm

v2

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I.explore.code 5-Aug-13 4:18am

have you tried Googling for this? i would be surprised if you did but didn't get any relevant results. This is a pretty common problem and has hundreds of posts on the matter. Obviously your DropDownList is meant to be "trigger" (hint).

Uwakpeter 5-Aug-13 5:00am

yes i did all that, but still not working, many solutions on google dont seem to work! i dont know why, i even check the config file to remove the legacy lineof code. any further help will be appreciated.

I.explore.code 5-Aug-13 5:16am

can you put the rest of page mark-up on here as well? i have just tried with your code and it seems to work..something else must be amiss.

Uwakpeter 5-Aug-13 5:37am

yes it works fine if i use it on a new project, i have an existing project that i want to use Ajax on all the form pages, but it is not working on this existing project!

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Harshil_Raval · Answer 1 · 2013-08-05T01:21:00

XML

Try,

  <asp:UpdatePanel ID="UpdatePanel1" runat="server">
   <ContentTemplate>
    <asp:DropDownList ID="DropDownList2" runat="server" AutoPostBack="True"
                    style="z-index: 1; left: 548px; top: 366px; position: absolute">
                    <asp:ListItem>---Select---</asp:ListItem>
                    <asp:ListItem>True</asp:ListItem>
                    <asp:ListItem>False</asp:ListItem>
    </asp:DropDownList>
 </ContentTemplate>
<Triggers>
  <asp:AsyncPostBackTrigger ControlID="your control which postback" EventName="event name" />
  </Triggers>
 </asp:UpdatePanel>

Hope it helps.