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See more: ASP.NET VB.NET
i have radiobuttonlist with in update panel.
radiobutton_selectchanged event are not fired.
<asp:Panel ID="SelectAttributesPanel" runat="server" Width="230px" BackColor="#F0F8FF" BorderColor="Black" BorderWidth="1" Font-Names="Verdana" Font-Size="X-Small" >
 <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
                                        <asp:RadioButtonList ID="rdbRemarks" runat="server" RepeatDirection="Horizontal"
<asp:ListItem Value="F1">Accept</asp:ListItem>
<asp:ListItem Value="F1">Objection Clear</asp:ListItem>
<asp:ListItem Value="F4">Objection</asp:ListItem>
<asp:ListItem Value="R">Reject</asp:ListItem>
 <asp:AsyncPostBackTrigger ControlID="rdbRemarks" EventName="SelectedIndexChanged" />
 </asp:UpdatePanel> </asp:Panel>
Posted 5-Nov-12 18:29pm
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Solution 1

You are missing OnSelectedIndexChanged="radiobutton_selectchanged" in the radio button
                <asp:radiobuttonlist id="rdbRemarks" runat="server" AutoPostBack="True" repeatdirection="Horizontal" OnSelectedIndexChanged="radiobutton_selectchanged ">
                    <asp:listitem value="F1">Accept</asp:listitem>
                    <asp:listitem value="F1">Objection Clear</asp:listitem>
                    <asp:listitem value="F4">Objection</asp:listitem>
                    <asp:listitem value="R">Reject</asp:listitem>
also the code behind must have this handler defined
    protected void radiobutton_selectchanged(object sender, EventArgs e)
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Solution 2

Your All Code is almost right but u missing onselectedindexchanged events in radio button list so first double click events in radio button list in your design page so it generate radiobutton_selectchanged in back end code then check ….

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