c# - Linkbutton is not working using ASP.NET -

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i have written code comment , view more button ,comment working view more not working, code view more button mentioned below:-

my aspx code here

<asp:datalist id="datalist1" runat="server" datasourceid="sqldatasource1"> <itemtemplate>     <div style="border-radius: 10px; height: inherit; padding-bottom:20px; margin-bottom:10px; padding-left:10px; padding-right:10px; padding-top:10px; width: 600px; font-family:verdana; min-height:40px; color: rgb(51, 51, 51); background-color: rgb(237, 237, 237); border-bottom: 2px groove rgb(54, 51, 51);">         comment:         <asp:label id="commentlabel" runat="server" text='<%# eval("comment") %>' />         <br />         <div style="float:right; margin-bottom:5px;">             <asp:label id="personlabel" runat="server" text='<%# eval("person") %>' />     </div></div> </itemtemplate> </asp:datalist>   <asp:sqldatasource id="sqldatasource1" runat="server"       connectionstring="<%$ connectionstrings:lpsconnection %>"       selectcommand="select top(@topval)  [comment], [person] [commentinterview] (([approved] = @approved) , ([interviewid] = @id)) order [id] desc">      <selectparameters>         <asp:parameter name="topval" defaultvalue="3" type="int32" />         <asp:parameter name="approved" defaultvalue="approved" type="string" />         <asp:controlparameter controlid="label7" name="id" propertyname="text"                        type="int32" />     </selectparameters> </asp:sqldatasource> <br />  <asp:linkbutton id="linkbutton1" runat="server"  onclick="linkbutton1_click">view more</asp:linkbutton>

and c# code here:-

  protected void linkbutton1_click(object sender, eventargs e)   {     this.sqldatasource1.selectparameters["topval"].defaultvalue = (int.parse(this.sqldatasource1.selectparameters["topval"].defaultvalue) + 12).tostring();   }

problem link button not firing event when click on it. don't know problem , how resolve please help. in advance.


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