Tips for converting vb to c# web in application

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VB6

C#

web

hi.... please help me to convert from vb to c# in for below declarations in vb6..

Dim App As Word.Application
Dim Doc As Word.Document
Dim oFs As New FileSystemObject
Dim objFSO As New FileSystemObject
Dim subFolder As Folder
Dim oFolder As Folder
Dim oFile As File
FolderSpec = txtSource.Text

and please give me info on how to add the applications to our project like word,folder,text,file...