Problem with update panel

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C#

ASP.NET

C#3.5

Hi guys,

I was using update panel in a repeater,
n in repeater i have a button which will generate the report.

but when i use update panel, the button in the repeater is not working...

My Code:

<div class="form-horizontal well">
                                    <fieldset>
                                    <legend>Select Details</legend>
                                    <table>
                                    <tr>
                                    <td>Year</td>
                                    <td>
                                        <asp:TextBox ID="txtyear" CssClass="form-control" runat="server"></asp:TextBox>
                                    </td>
                                    <td>
                                    Select Month
                                    </td>
                                    <td>
                                        <asp:DropDownList ID="ddlmnth" CssClass="form-control" runat="server">
                                        </asp:DropDownList>
                                    </td>
                                    <td>
                                        <asp:Button ID="btnOK" runat="server" Text="OK" Width="80px" 
                                            CssClass="btn btn-sm btn-success" onclick="btnOK_Click" />
                                    </td>
                                    </tr>
                                    </table>
                                    </fieldset>
                                    </div>
                                    <br />
                                    <asp:UpdatePanel ID="UpdatePanel1" runat="server">
                                    <ContentTemplate>
                                    
                                    <asp:Repeater ID="Repeater1" runat="server">
                                     <HeaderTemplate>
                                                <table class="table table-bordered table-hover">
                                                    <thead class="bg-dark lt">
                                                        <tr>
                                                            <th>
                                                                S.No#
                                                            </th>
                                                            <th>
                                                                Project
                                                            </th>
                                                            <th>
                                                                Job Code
                                                            </th>
                                                            <th>
                                                                Status
                                                            </th>
                                                            <th>
                                                                Date
                                                            </th>
                                                            <th>
                                                                Action
                                                            </th>
                                                            
                                                        </tr>
                                                    </thead>
                                                    <tbody>
                                            </HeaderTemplate>
                                            <ItemTemplate>
                                                <tr id="itemrow">
                                                    <td valign="middle" style="width: 50px">
                                                        
                                                            <%# Container.ItemIndex + 1 %>
                                                        
                                                    </td>
                                                    <td>
                                                        "color: rgba(255, 165, 0, 1)">
                                                    </td>
                                                    <td>
                                                        ^__b>
                                                            <asp:Label ID="lblstatus" runat="server" Text='<%# Eval("status") %>'></asp:Label> 
                                                        
                                                    </td>
                                                    <td>
                                                        ^__b>
                                                           <%# Eval("Pdate") %>
                                                        
                                                    </td>
                                                    <td>
                                                        <asp:Button ID="btnrpt" CommandArgument='<%# Eval("RecID") %>' OnClick="btnrpt_Click" runat="server" Text="Report" CssClass="btn btn-sm btn-info" />
                                                    </td>
                                                    </tr>
                                                     </ItemTemplate>
                                            <FooterTemplate>
                                                </tbody> </table>
                                            </FooterTemplate>
                                    </asp:Repeater>
                                    
                                    </ContentTemplate>
                                    <Triggers>
                                    <%--<asp:AsyncPostBackTrigger ControlID="btnOK" />--%>
                                    <asp:PostBackTrigger ControlID="btnOK" />
                                    </Triggers>
                                    </asp:UpdatePanel>

code for report button:

protected void btnrpt_Click(object sender, EventArgs e)
        {
            int prjid = Convert.ToInt32(((Button)(sender)).CommandArgument.ToString());
            Response.Write("<script>");
            Response.Write("window.open('PrjDetails.aspx?RECID=" + prjid + "','_blank')");
            Response.Write("</script>");
        }

Can anyone plzzzz... help me.

Thanks