how to delete and download file and read on basis of date

Hi,

i am reading folder files on basis of date, how to download and delete on click of gridview.

as mentiond in url

http://www.aspsnippets.com/Articles/Display-list-of-files-from-Server-folder-in-ASPNet-GridView.aspx

<asp:GridView ID="GridView1" CssClass="grid" GridLines="None" ShowFooter="true"
                                    AllowPaging="true" PageSize="5"
                                    AutoGenerateColumns="false"
                                    OnPageIndexChanging="GridView1_PageIndexChanging" runat="server">

                                    <Columns>
                                        <asp:TemplateField HeaderText="Name">
                                            <ItemTemplate>
                                                <asp:Label ID="lblName" runat="server" Text='<%#Eval("Name")%>'></asp:Label>
                                            </ItemTemplate>
                                        </asp:TemplateField>
                                        <asp:TemplateField HeaderText="File Length">
                                            <ItemTemplate>
                                                <asp:Label ID="lblLen" runat="server" Text='<%#Eval("Length")%>'></asp:Label>
                                            </ItemTemplate>
                                        </asp:TemplateField>
                                        <asp:TemplateField HeaderText="File Extention">
                                            <ItemTemplate>
                                                <asp:Label ID="lblFileType" runat="server" Text='<%#Eval("Extension")%>'>
                                                </asp:Label>
                                            </ItemTemplate>
                                        </asp:TemplateField>
                                        <asp:TemplateField HeaderText="Creation Date & Time">
                                            <ItemTemplate>
                                                <asp:Label ID="lblDateTime" runat="server" Text='<%#Eval("CreationTime")%>'>
                                                </asp:Label>
                                            </ItemTemplate>
                                        </asp:TemplateField>
                                    </Columns>
                                </asp:GridView>

                               
                                    <asp:Label Text="" ID="lblMsg" runat="server"></asp:Label>
                               

 <asp:ListBox ID="drop1" Rows="3" runat="server">
                                        <asp:ListItem Selected="true">All</asp:ListItem>
                                        <asp:ListItem>pdf</asp:ListItem>
                                        <asp:ListItem>jpg</asp:ListItem>
                                        <asp:ListItem>png</asp:ListItem>
                                        <asp:ListItem>txt</asp:ListItem>
                                        <asp:ListItem>doc</asp:ListItem>
                                    </asp:ListBox>

                                    <input type="button" id="btShowFiles" onserverclick="btShowFiles_Click" value="Show Files" runat="server" />

 How to enable delete and download in below code, as all code works fine

  protected void btShowFiles_Click(object sender, EventArgs e)
    {
        ViewState["FileType"] = drop1.SelectedValue;     // GET THE FILE TYPE.
        GetFilesFromFolder();
    }

    // GRIDVIEW PAGING.
    protected void GridView1_PageIndexChanging(object sender, System.Web.UI.WebControls.GridViewPageEventArgs e)
    {
        GridView1.PageIndex = e.NewPageIndex;
        GetFilesFromFolder();
    }

    private void GetFilesFromFolder()
    {
        // GET A LIST OF FILES FROM A SPECIFILED FOLDER.
        DirectoryInfo objDir = new DirectoryInfo(Server.MapPath("media\\"));
        DateTime from_date = DateTime.Now.AddYears(-35);
        DateTime to_date = DateTime.Now.AddDays(1);
        FileInfo[] listfiles = objDir.GetFiles("*." + ((string)ViewState["FileType"] != "All" ? ViewState["FileType"] : "*")).Where(file => file.CreationTime >= from_date && file.CreationTime <= to_date).ToArray();


        if (listfiles.Length > 0)
        {
            // BIND THE LIST OF FILES (IF ANY) WITH GRIDVIEW.
            GridView1.Visible = true;
            GridView1.DataSource = listfiles;
            GridView1.DataBind();

            lblMsg.Text = listfiles.Length + " files found";
        }
        else
        {
            GridView1.Visible = false;
            lblMsg.Text = "No files found";
        }
    }