How to read the content of a .doc or .docs file and display the content at webpage in asp.net web application

By ".docs" I believe you meant to say ".docx", right?
Anyway the problem is that currently browsers cannot render the words documents so you'll have to convert your file's content into a format that a browsers can render.
For example HTML or maybe PDF (because all modern browsers are capable of rendering them) or maybe an image file (so you would get a preview document effect).

Now there are few libraries capable of doing this for you, I'm familiar with this C# library for word documents. It can process (both open and convert) the .doc files in C# but also it can manipulate with .docx files in C# as well in the same manner.
What you would need to do is just open your Word file with C# and then do a straightforward conversion of that Word file into a HTML content in .NET and then just write out that HTML content to response's output stream.

I hope this helps.