I want to display file list in the GridView like the following way inside the master page.

Display PDF from folder in ASP.Net GridView and open in browser on LinkButton click using C# and VB.Net

I wrote the same code but it is not showing me any file.

How to fix it? Here is my Code

<%@ Page Title="Handouts" Language="C#" MasterPageFile="~/Demo.master" AutoEventWireup="true"
    CodeFile="frmHandouts.aspx.cs" Inherits="frmHandouts" %>

<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="Server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">
    <div class="content-wrapper">
        <div class="content">
            <div class="connectedSortable" style="margin-left: 10px;">
                <div class="col-sm-1">
                </div>
                <div class="col-md-10">
                    <div class="col-md-4 ">
                        <br />
                        <br />
                        <asp:Label ID="lblMessage" runat="server" Text="" Font-Names="Arial"></asp:Label>
                    </div>
                    <br /><br />
                    <div class="modal-content">
                        <div class="modal-header" style="background-color: #4682B4; color: #fff">
                            <h4><span class="fa fa-download"></span>&nbsp; Download Files</h4>
                        </div>
                        <div class="modal-body">
                            <div class="row">
                                <div class="col-sm-12 ">
                                    <div class="table-responsive">
                                        <asp:GridView runat="server" ID="grvDocuments" Width="100%" Class="table table-striped table-bordered table-hover"
                                            AutoGenerateColumns="false">
                                            <Columns>
                                                <asp:TemplateField HeaderText="S.No">
                                                    <ItemTemplate>
                                                        <asp:Label ID="lblRowNumber" Text='<%# Container.DataItemIndex + 1 %>' runat="server" />
                                                    </ItemTemplate>
                                                </asp:TemplateField>
                                                <asp:BoundField DataField="Text" HeaderText="Document Name" />
                                                <asp:TemplateField HeaderText="">
                                                    <ItemTemplate>
                                                        <asp:HyperLink ID="lnkView" Text="View" NavigateUrl='<%# Eval("Value", "~/frmHandoutsView.aspx?fileName={0}") %>'
                                                            runat="server" Target="_blank" />
                                                    </ItemTemplate>
                                                </asp:TemplateField>
                                            </Columns>
                                        </asp:GridView>
                                    </div>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </div>
</asp:Content>

and code is

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            if (Request.QueryString["id"] != null)
            {
                int ITCode = int.Parse(Request.QueryString["id"].ToString());
                GetDocuments(ITCode);
            }
        }
    }
    protected void GetDocuments(int ITCode)
    {
        string[] filePaths = Directory.GetFiles((@"C:\Reports" + ITCode));
        List<ListItem> files = new List<ListItem>();
        foreach (string filePath in filePaths)
        {
            files.Add(new ListItem(Path.GetFileName(filePath), filePath));
        }
        grvDocuments.DataSource = files;
        grvDocuments.DataBind();
    }