how to save MS Word doc to database and show on webpage??

Well you will definitely need to convert your DOCX to a HTML format with C# in order to add that content to a DIV. But using the word interop with C# on server side does have its issues, also you cannot avoid the steps of generating the physical files which you would eventually need to delete.

But the problem that I had with this approach is that you simply cannot (at least I didn't find any way...) embed the images as data URIs:
http://en.wikipedia.org/wiki/Data_URI_scheme

So as an alternative here is an approach that you can use to read and convert your DOCX file's stream in C# (no physical file is needed) and then retrieve the HTML content as a string with an embedded images inside of it:

// Load DOCX documment's content from a stream.
var document = DocumentModel.Load(docxStream, LoadOptions.DocxDefault);
 
string htmlContent;
using (Stream htmlStream = new MemoryStream())
{
    // Set HTML format options.
    var options = new HtmlSaveOptions();
    options.EmbedImages = true;
    options.HtmlType = HtmlType.HtmlInline;
 
    // Save documment's content in HTML format to stream.
    document.Save(htmlStream, options);
    htmlStream.Seek(0, SeekOrigin.Begin);
 
    // Get HTML content as string.
    htmlContent = new StreamReader(htmlStream, options.Encoding).ReadToEnd();
}

The code uses this word component for .NET framework.