Download files from Folder (Directory) on GridView Button Click using C# and VB.Net in ASP.Net

I have a code that shows some chart. and download some files that their address saved in DB.

I want to download that file if the user clicks on download btn and show my chart if user click on show chart,

this is my code:

                        <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataSourceID="SqlDataSource1">
                            <Columns>
                                <asp:BoundField DataField="id" HeaderText="id" SortExpression="id" />
                                <asp:BoundField DataField="primaryId" HeaderText="primaryId" SortExpression="primaryId" />
                                <asp:BoundField DataField="ExFIleName" HeaderText="ExFIleName" SortExpression="Excel filename" />
                                <asp:TemplateField HeaderText="ExFilePath" SortExpression="ExFilePath">
                                    <EditItemTemplate>
                                        <asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("ExFilePath") %>'></asp:TextBox>
                                    </EditItemTemplate>
                                    <ItemTemplate>
                                        <a class="btn btn-danger" href="<%#DataBinder.Eval(Container.DataItem, "ExFilePath")%>" target="_parent">Download</a>
                                    </ItemTemplate>
                                </asp:TemplateField>
                                <asp:BoundField DataField="SimeFileName" HeaderText="SimeFileName" SortExpression="SimeFileName" />
                                <asp:TemplateField HeaderText="SimeFilePath" SortExpression="SimeFilePath">
                                    <EditItemTemplate>
                                    </EditItemTemplate>
                                    <ItemTemplate>
                                        <a class="btn btn-success" href="<%#DataBinder.Eval(Container.DataItem, "SimeFilePath")%>" target="_parent">Download</a>
                                    </ItemTemplate>
                                </asp:TemplateField>
                                <asp:TemplateField>
                                    <ItemTemplate>
                                        <asp:LinkButton ID="lnkShowChrt" Text="ShowCharts" CommandArgument='<%# Eval("ExFilePath") %>' runat="server" />
                                    </ItemTemplate>
                                </asp:TemplateField>
                            </Columns>
                        </asp:GridView>
                        <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:CostThesisConnectionString %>" SelectCommand="SELECT * FROM [Files]"></asp:SqlDataSource>

MonthlyCost.js

var MonthlyCostConfig = {
    type: 'bar',
    data: {
        datasets: [{
 
            barPercentage: 0.5,
 
            backgroundColor: 'rgb(196, 230, 255)',
            borderColor: 'transparent',
            borderWidth: 1
        }]
    },
    plugins: [ChartDataSource],
    options: {
        //maintainAspectRatio :false,
        legend: { display: true },
        title: {
            display: true,
            text: 'Monthly Cost'
        },
        scales: {
            xAxes: [{
                scaleLabel: {
                    display: true,
                    labelString: 'Month'
                }
            }],
            yAxes: [{
                scaleLabel: {
                    display: true,
                    labelString: 'Value'
                }
            }]
        },
        plugins: {
            datasource: {
                type: 'sheet',
                url: '',
                rowMapping: 'index',
                datasetLabels: 'Monthly Cost!B2',
                indexLabels: 'Monthly Cost!A3:A',
                data: 'Monthly Cost!B3:B'
            }
        }
    }
};

<script>
    $(function () {
        $('[id*=lnkShowChrt]').on('click', function () {
            var ctxMonthCost = document.getElementById('MonthlyCost').getContext('2d');
            MonthlyCostConfig.options.plugins.datasource.url = "./Uploads/" + $(this).closest('tr').find('td').eq(0).html();
            window.MonthlyCost = new Chart(ctxMonthCost, MonthlyCostConfig);
            return false;
        });
    });
</script>

DB:

But my code didn't do any of that.

How can I do them?!