Read word document and Save changes in word document located in folder

In ASP.Net Web application(.Net2.0) I have to save a word document in folder called "Documents" and after saving i have to open the word document for making some changes.I want that the changes

must be saved in word document and it Word Document get replaced by orginal one in "Documents"

folder.

 I have searched on net and come across rich text editor developed in windows(c#)

but i want to develop same functionality in Web Application in C#.

 Plz anyone help.

Regards
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