How to open the pdf file appearing as hyperlink on click.

I have the following code, which fethes the pdf files names searched for in a grid.
It file appears as hyperlink into the grid.
How to open that file. which ever is clickd.

<asp:TextBox ID="txtid" runat="server"></asp:TextBox>
        <asp:Button ID="btnsearch" runat="server" Text="Button" onclick="Button1_Click" />
       <asp:GridView ID="GridView1" runat ="server" CellPadding ="3" CellSpacing ="3" >
       <Columns>
          <asp:TemplateField HeaderText ="File">
    <ItemTemplate >

    <asp:HyperLink ID ="hyFile" runat="server" Text ='<%#Eval("Filename") %>' NavigateUrl ='<%#Eval("Filename") %>' ></asp:HyperLink>
    </ItemTemplate>
    </asp:TemplateField>
</Columns>
</asp:GridView>

code behind

protected void btnsearch_Click(object sender, EventArgs e)
    {
        var lstFiles = Directory.GetFiles(MapPath("Files/"), string.Format("{0}_*.pdf".ToUpper(), txtid.Text), SearchOption.AllDirectories).Select(f => new { FileName = f.Substring(f.LastIndexOf('\\') + 1)}).ToList();
        GridView1.DataSource = lstFiles;
        GridView1.DataBind();
    }
searchsanjaysharmaAsked:
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Dave BaldwinFixer of ProblemsCommented:
I don't understand your question.  If it is a PDF file with a '*.pdf' extension, then it should open in the browser when clicked if the Adobe Reader plugin is installed in your browser.  Otherwise, clicking on the link should ask if you want to download the file.
searchsanjaysharmaAuthor Commented:
Its not happening. I m getting the hyperlink, but file is not getting opened or download.
*.pdf means the files are only of pdf files.
Dave BaldwinFixer of ProblemsCommented:
Please show me the hyperlink in the "View Source" of your browser.  I ask for that because that is what the browser sees, not your ASP code above.
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searchsanjaysharmaAuthor Commented:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head><title>
      Untitled Page
</title></head>
<body>
    <form name="form1" method="post" action="Default.aspx" id="form1">
<div>
<input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="/wEPDwUKLTkwMDc5MTQ2MQ9kFgICAw9kFgICBQ88KwANAgAPFgQeC18hRGF0YUJvdW5kZx4LXyFJdGVtQ291bnQCAWQMFCsAARYIHgROYW1lBQhGaWxlTmFtZR4KSXNSZWFkT25seWgeBFR5cGUZKwIeCURhdGFGaWVsZAUIRmlsZU5hbWUWAmYPZBYEAgEPZBYEZg9kFgICAQ8PFgQeBFRleHQFIUFBQUFLNTM4OUZfRk9STTE2QV8yMDEyLTEzX1EyLnBkZh4LTmF2aWdhdGVVcmwFIUFBQUFLNTM4OUZfRk9STTE2QV8yMDEyLTEzX1EyLnBkZmRkAgEPDxYCHwYFIUFBQUFLNTM4OUZfRk9STTE2QV8yMDEyLTEzX1EyLnBkZmRkAgIPDxYCHgdWaXNpYmxlaGRkGAEFCUdyaWRWaWV3MQ88KwAKAQgCAWQDxOIp2cjX8Ovw3wYqo+v0jPZUEw==" />
</div>

<div>

      <input type="hidden" name="__EVENTVALIDATION" id="__EVENTVALIDATION" value="/wEWAwKzsq7zDALs0bLrBgKM54rGBiezstXwSj+EQ+txrINSYt7iN73v" />
</div>

    <div>
        <input name="TextBox1" type="text" value="AAAAK5389F" id="TextBox1" />
        <input type="submit" name="Button1" value="Button" id="Button1" />
       <div>
      <table cellspacing="3" cellpadding="3" rules="all" border="1" id="GridView1">
            <tr>
                  <th scope="col">File</th><th scope="col">FileName</th>
            </tr><tr>

                  <td>

    <a id="GridView1_ctl02_hyFile" href="AAAAK5389F_FORM16A_2012-13_Q2.pdf">AAAAK5389F_FORM16A_2012-13_Q2.pdf</a>
    </td><td>AAAAK5389F_FORM16A_2012-13_Q2.pdf</td>
            </tr>
      </table>
</div>
                 
    </div>
    </form>

</body>
</html>
Dave BaldwinFixer of ProblemsCommented:
If this file 'AAAAK5389F_FORM16A_2012-13_Q2.pdf' is in the same directory as the web page, then it should open or download.  If instead it is in another directory like "Files/", then the link needs to be href="Files/AAAAK5389F_FORM16A_2012-13_Q2.pdf".

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searchsanjaysharmaAuthor Commented:
How to put Files folder in hyperlink NavigatrURL
as Files/ does work there

<asp:HyperLink ID ="hyFile" runat="server" Text ='<%#Eval("Filename") %>' NavigateUrl ='<%#Eval("Filename") %>' ></asp:HyperLink>
searchsanjaysharmaAuthor Commented:
ok
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