OFFICE

 

  object copies = "1";
            object pages = "";

            object oMissing = System.Reflection.Missing.Value;
            Microsoft.Office.Interop.Word.Application word = new Microsoft.Office.Interop.Word.Application();
            Microsoft.Office.Interop.Word.Document doc = word.Documents.Open(@"C:\Users\\Desktop\Report3.docx", ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing);
            doc.PageSetup.Orientation = WdOrientation.wdOrientLandscape;
            doc.Activate();
            doc.PrintOut(oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing);

 http://www.c-sharpcorner.com/UploadFile/muralidharan.d/how-to-create-word-document-using-C-Sharp/