在DataGrid的默认查看器中打开PDF

我有一个显示名称&链接到一个文件夹中的所有PDF文件。该链接在浏览器中打开该文件。

这是不理想的，因为浏览器缓存文件，所以如果一个文档被移动或更改，旧的缓存版本仍然是可访问的。

是否有可能让链接在默认安装的pdf查看器中打开文件，并完全避免缓存?

这是我的网格代码:

<form runat="server">
Search for a file: <asp:TextBox ID="txtFilter" runat="server"></asp:TextBox>
    <asp:Button ID="btnShow"
        runat="server" Text="Display" onclick="btnShow_Click" />
</form>

<asp:DataGrid runat="server" id="FileList" Font-Name="Verdana" CellPadding="5"
AutoGenerateColumns="False" AlternatingItemStyle-BackColor="#eeeeee"
HeaderStyle-BackColor="Navy" HeaderStyle-ForeColor="White"
HeaderStyle-Font-Size="15pt" HeaderStyle-Font-Bold="True">
<Columns>
<asp:HyperLinkColumn DataNavigateUrlField="Name" DataTextField="Name" 
       HeaderText="File Name" target="_blank"/>
<asp:BoundColumn DataField="LastWriteTime" HeaderText="Last Write Time"
    ItemStyle-HorizontalAlign="Center" DataFormatString="{0:d}" />
</Columns>
</asp:DataGrid>  

CS:

protected void btnShow_Click(object sender, EventArgs e)
    {
     ShowData();
    }
    public void ShowData()
    {
        DirectoryInfo dirInfo = new DirectoryInfo(Server.MapPath(""));
        FileInfo[] info = dirInfo.GetFiles("*.pdf");            //Get FileInfo and Save it a FileInfo[] Array
        List<Getfiles> _items = new List<Getfiles>();          // Define a List with Two coloums
        foreach (FileInfo file in info) //Loop the FileInfo[] Array
           _items.Add(new Getfiles { Name = file.Name, LastWriteTime = file.LastWriteTime.ToString("MM/dd/yyyy") });  // Save the Name and LastwriteTime to List

        var tlistFiltered1 = _items.Where(item => item.Name.Contains(txtFilter.Text)); // Find the file that Contains Specific word in its File Name
        FileList.DataSource = tlistFiltered1; //Assign the DataSource to DataGrid
        FileList.DataBind();
    }
    public class Getfiles
    {
        public string Name { get; set; }
        public string LastWriteTime { get; set; }
    }

<asp:HyperLinkColumn DataNavigateUrlField="Name" DataTextField="Name" 
       HeaderText="File Name" target="_blank"  DataNavigateUrlFormatString="Download.aspx?FileName={0}" />

       protected void Page_Load(object sender, EventArgs e)
        {
            string FName = Server.MapPath(@"Files'" + Request.QueryString["FileName"].ToString());
            Response.Clear();
            Response.ContentType = "application/pdf";
            Response.AppendHeader("Content-Disposition", "attachment; filename=" + FName);
            Response.TransmitFile(FName);
            Response.End(); 
        }