How do I grab a document which is already open from inside .NET

Hi there,

I've posted a few questions today, and I'm nearly there with what I'm trying to acheive. Much appreciation for the help recieved already.

My next query is regarding the way that .NET takes control of the documents. Basically, my program launches when the user clicks a button on a Word toolbar. The filename of the document is passed through to the program, and the c# program is then supposed to take input from a textbox and then insert that at the cursor's position in the Word Document.

Problem seems to be that I am trying to open the document again to allow the Word object to work. However, in this scenario, when I try to insert the text into the original document, it tells me 'The file is locked for editing by such and such - try one of these options' which then asks if I want to merge the changes, which I don't. I want it to just insert the new text and have no issues with who has permission on the file at that moment.

It seems to me that I either need my .NET program to imitate the user who has control over the document, or that my .NET program has to 'grab' the handle of the MS document and use that to populate the Word object. Can someone shed some light on this situation please? Much obliged. Oh, and please don't send me links for the hell of it - you're not getting any points if you put a link without expanding a bit on what the deal is.

Cheers

Andy

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// TWO that haven't worked 
//msWordDoc = msWordApp.Documents.Open(ref RTFfilepath, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing);
                
//msWordDoc = msWordApp.Documents.get_Item(ref missing); 
string filename = Path.GetFileName((string)RTFfilepath);              
//doesn't work, but I'm looking for something like this - so that the program grabs the 'handle' of the document if you like but doesn't have to open it. Do I have to look into imitating permissions??
msWordDoc = msWordApp.Documents(filename) 

msWordApp.Content.InsertAfter(theText);