Create Word Document in vb.net

Question

Hi,

I need to create a new ms word document with my desired given name using vb.net.

For that i have written a simple code as below

Dim wordApp As Microsoft.Office.Interop.Word.Application

Dim wordDoc As Microsoft.Office.Interop.Word.

wordApp = New Microsoft.Office.Interop.Word.Application

wordDoc = wordApp.Documents.Add

wordApp.Visible = True

This code runs perfectly, but i want to create a new document with my given name.

I want to give it name as "Order No. 1" 

where the text "Order No." will be static and the number will be fetched from database and added +1

for that i have tried 

Dim wordName as Object "Order No."

wordDoc = wordApp.Documents.Add(wordName)

but this line gives error.

COMException was unhandled

Word was unable to read this document. It may be currupt.

Try one or more of the following:

* Open and Repair the file.

Whats the error in my code, please inform me.

More i want to ask you is that i have searched in google 

where every one use Word.Application, but i have to use Microsoft.Office.Interop.Word.Application

where i have imported Microsoft.Office.Interop.Word.

Give Proper Solution.

Thanks