read a pdf file and write content to word document in c#

Here in Codeproject you can find good sources and answers:
www.codeproject.com/Articles/12445/Converting-PDF-to-Text-in-C

or:
www.melbtest.com.au/woa/pdf-excel_download.htm

You can use iText library available in c#.

You may also work with PDFFocus.Net library file.
By using PDF Focus.Net, the code to convert pdf to word will be as small as :

SautinSoft.PdfFocus f = new SautinSoft.PdfFocus();
f.OpenPdf(@"c:\Pushkin Poems.pdf");
if (f.PageCount > 0)
{               
f.ToWord(@"c:\Pushkin Poems.doc");
}