unable to do the Click event in the linkbutton in the repeater inside the panel

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ASP.NET

Ajax

C#5.0

Hi,
I am unable to do the Click event in the linkbutton in the repeater inside the panel, so please provide me the solution.

.aspx page

<asp:ScriptManager ID="sss" runat="server"></asp:ScriptManager>
<asp:Timer ID="Timer1" runat="server" Interval="5000" ontick="Timer1_Tick">
</asp:Timer>
<asp:Panel ID="Panel3" runat="server" BackColor="white" style="display:none" BorderWidth="1" Width="500px" Height="200px" BorderColor="#108EBF">
<center>
<div class=" col-sm-5 ">
<asp:Repeater ID="rptnewmsg" runat="server" >
<ItemTemplate>
<div style=" width:300px; height:150px; border:solid 0px red;">
<a style=" color:Black;"> File received from </a> <asp:Label ID="lblclientnamessTF" runat="server" Text='<%#Eval("Clientname") %>'></asp:Label> <a style=" color:Black;"> for </a> <asp:Label ID="Label2" runat="server" Text='<%#Eval("Boardtype") %>'></asp:Label> <br />
<asp:LinkButton ID="lnkbtnmsg" runat="server" CausesValidation="true" CommandArgument='<%Eval("Id") %>' ValidationGroup="hoo" OnClick="lnkbtnmsg_Click" Text="unread" ></asp:LinkButton><br /><br />
</div>
</ItemTemplate>
</asp:Repeater>
<button id="btncancelss" type="button" class="btn btn-default" data-dismiss="modal">Close</button>
<div class="modal-body" style=" margin-removed50px;">
</div>
</div>
</center>
</asp:Panel>
<asp:ModalPopupExtender ID="ModalPopupExtender3" BehaviorID="ModalPopupExtender3" runat="server" Enabled="true" PopupControlID="Panel3" TargetControlID="Panel3" CancelControlID="btncancelss" OnCancelScript="hidepopupss()" BackgroundCssClass="modalback">
</asp:ModalPopupExtender>
</asp:ModalPopupExtender>

.cs page

protected void Timer1_Tick(object sender, EventArgs e)
{
Newmsgbind();
ModalPopupExtender3.Show();
}
 
public void Newmsgbind()
{
SqlDataAdapter da_newmsg = new SqlDataAdapter("select Id,Clientname,Boardtype ,Date from Newmessage where Readstatus ='" + 0 + "'", con);
DataSet ds_newmsg = new DataSet();
da_newmsg.Fill(ds_newmsg);
 
rptnewmsg.DataSource = ds_newmsg;
rptnewmsg.DataBind();
}
 
protected void lnkbtnmsg_Click(object sender, EventArgs e)
{
string lnkbtnmsg = (sender as LinkButton).CommandArgument;
con.Open();
 
SqlCommand cmdupdatemsg = new SqlCommand("update Newmessage set Readstatus ='" + 1 + "' where Id = '" + lnkbtnmsg + "'", con);
cmdupdatemsg.ExecuteNonQuery();
 
con.Close(); 
}