Please see my comment to the question. Don't export grid view, export the data used to populate this grid view. It will help you in many ways, first of all, in code maintenance. You already have some data layer represented by your database. Generate the documents out of the database, using the same query you used to populate the controls.
To work with Word, you can use either Office interop assembly or Open XML DSK. Please see my past answers. I put most of the link to my answers in this one:
How to add microsoft excel 15.0 object library from Add Reference in MS Visual Studio 2010[
^].
—SA