Working with word Document for mail merge

Hello ,

 i am new in using word with development asp.net using c#,

 i am using visual studio 2008 .

  i have  written this code..

 {

   var application = new Microsoft.Office.Interop.Word.Application();
var document = new Microsoft.Office.Interop.Word.Document();

document = application.Documents.Add(Template: @"E:\XXXXX\XXXXX.docx");

 

ans so on.......

}

    The Template is not predefine  here and not working. but the exact code is working in 2010 visual studio.

 

Thanx in advance.