I need to show gridview in model page on button click, the page is poping but not showing data. please guide

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.0/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script>
<asp:UpdatePanel ID="upContent" runat="server">
    <ContentTemplate>
        <div id="divButtons">
            <table class="table table-bordered ">
                <tr>
                    <td style="text-align: center;">
                        <button type="button" class="btn  btn-primary " data-toggle="modal" data-target="#myModal" id="lnkSearch">Show Product</button>
                     </td>
                 </tr>
             </table>
         </div>
    <div class="modal fade" id="myModal" onload="lnksearch_click" tabindex="-1" role="dialog" aria-labelledby="exampleModalCenterTitle" aria-hidden="true" >
        <div class="modal-dialog modal-dialog-centered"> 
            <div class="modal-dialog modal-dialog-centered" role="document">
            <!-- Modal content-->
            <div class="modal-content">
                <div class="modal-header">
                    <button type="button" class="close" data-dismiss="modal">&times;</button>
                    <h4 class="modal-title">Search Product</h4>
                </div>
                <div class="modal-body">
                    <div class="box-body table-responsive">
                        <div class="row" id="divSearch" runat="server" visible="true">
                            <asp:GridView ID="gvPaymentHistory" runat="server" CssClass="table table-bordered table-hover dataTable"
                                        AutoGenerateColumns="false" DataKeyNames="MemberFeeID" ShowFooter="false">
                                        <Columns>
                                            <asp:TemplateField HeaderText="ID" SortExpression="ID">
                                                <ItemTemplate>
                                                    <asp:LinkButton ID="lblMemberLoanID" runat="server" CommandName="Select"
                                                        CommandArgument='<%#Eval("MemberFeeID").ToString + "," + Eval("MemberID").ToString + "," + Eval("MonthID").ToString%>' OnClick="lnkEditFeePayment_Click" 
                                                        Text='<%# Bind("MemberFeeID")%>'>
                                                    </asp:LinkButton>
                                                </ItemTemplate>
                                            </asp:TemplateField>
                                            <asp:BoundField DataField="TransDate" SortExpression="TransDate" HeaderText="Trans Date" DataFormatString="{0:dd-MMM-yyyy}"></asp:BoundField>
                                            <asp:BoundField DataField="MonthName" SortExpression="MonthName" HeaderText="Month Name" ></asp:BoundField>
                                            <asp:BoundField DataField="Debit" SortExpression="Debit" HeaderText="Debit" ItemStyle-HorizontalAlign="Right" DataFormatString="{0:n2}"></asp:BoundField>
                                            <asp:BoundField DataField="Credit" SortExpression="Credit" HeaderText="Credit" ItemStyle-HorizontalAlign="Right" DataFormatString="{0:n2}"></asp:BoundField>
                                            <asp:BoundField DataField="RunningTotal" SortExpression="RunningTotal" HeaderText="Running Total" ItemStyle-HorizontalAlign="Right" DataFormatString="{0:n2}"></asp:BoundField>
                                            <asp:TemplateField HeaderText="VoucherID" SortExpression="VoucherID">
                                                <ItemTemplate>
                                                    <asp:LinkButton ID="lblVoucherID" runat="server" CommandName="Select"
                                                        CommandArgument='<%#Eval("VoucherID").ToString %>' OnClick="lnkEditLoan_Click" 
                                                        Text='<%# Bind("VoucherID")%>' ItemStyle-HorizontalAlign="Right" >
                                                    </asp:LinkButton>
                                                </ItemTemplate>
                                            </asp:TemplateField>
                                            <asp:TemplateField>
                                                <ItemTemplate>
                                                    <asp:LinkButton ID="lnkDeleteFee" runat="server" CssClass="gridbuttonblue" CommandArgument='<%#Eval("MemberFeeID")%>' OnClick="lnkDeleteFee_Click">
                                                        <i class="icon-pencil icon-white"></i>Delete
                                                    </asp:LinkButton>
                                                </ItemTemplate>
                                                <ItemStyle HorizontalAlign="Center" />
                                            </asp:TemplateField>
                                        </Columns>
                                        <EditRowStyle BackColor="#2461BF" />
                                        <HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
                                        <PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
                                        <RowStyle BackColor="#EFF3FB" />
                                        <SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />
                                    </asp:GridView>
                        </div>
                    </div>
                    <%--<p>Some text in the modal.</p>--%>
                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-default btn-flat toolbtn" data-dismiss="modal">Close</button>
                    <asp:LinkButton ID="lnkSearchProduct1" runat="server" CssClass="btn btn-default btn-flat toolbtn" Text="Search Product"></asp:LinkButton>
                </div>
            </div>

        </div>
    </div>
  </div>
 </ContentTemplate>
</asp:UpdatePanel>

    Protected Sub lnkSearch_Click(ByVal sender As Object, ByVal e As EventArgs)
        If txtmemberid.Text = "" Then
            LoadFeeDetail(txtmemberid.Text)
        End If
    End Sub
    Private Sub LoadFeeDetail(ByVal ID As String)
        Dim objFeeDetail As New clsmemberContribution
        Dim dsFeeDetail As New DataSet
        objFeeDetail.MemberID = ID
        objFeeDetail.CompanyID = Session("CompanyID")
        If objFeeDetail.LoadMemberFeeDetail(dsFeeDetail) = False Then
            lblMessage.Text = "<div class=""alert alert-error"">" & objFeeDetail.ErrMessage & "</div>"
            gvPaymentHistory.DataSource = Nothing
            gvPaymentHistory.DataBind()
            Exit Sub
        End If
        If dsFeeDetail.Tables(0).Rows.Count = 0 Then
            'lblMessage.Text = "<div class=""alert alert-info"">No Data</div>"
            gvPaymentHistory.DataSource = Nothing
            gvPaymentHistory.DataBind()
        End If
        gvPaymentHistory.DataSource = dsFeeDetail.Tables(0).DefaultView
        gvPaymentHistory.DataBind()
        If gvPaymentHistory.Rows.Count > 0 Then
            gvPaymentHistory.HeaderRow.TableSection = TableRowSection.TableHeader
        End If
    End Sub