i have a problem in my project?

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C#

ASP.NET

i have a project that contains one folder with pdf files,word files.my requirement is that i need to display that files in webpage.
for that i am using this code

<a href="~/foldername/filename"></a>

but in this case it is not taken the url.
and if i take

<a href="filename.docx">

it downloads the files but it's not displaying in the same web page.