Thanks you Yudi, this project start correctly after adding

DataMember="DefaultView"

I can now add merge field and retrieve data from a data base, it works perfectly.

For my use case discussed previously i've got à simple question.

My document will be complex and i need to use the 'MS Word rules' for the mail merge. (the NEXT IF in the MS Word mailmerge is very important for us)

Screencapture of the rules : http://img155.imageshack.us/img155/8373/prtscrcapturew.jpg

Do you think i'ts possible with WebTextEditor ?

Ok, thanks, i try to make a sample.

In your example, the header will be repeated with every customers data no ?

There is an example :

http://img541.imageshack.us/img541/2697/prtscrcapture5.jpg

The Fig.1 and Fig.2 represent what i need for two pages for example. Note that the rows are generated automaticatly whith the datasource.

The Fig.3 represent the merge fields i will use (i think a kind like this).

Is it correct ?

The Fig.4 represent a second document with information about the first parent and their childs.

We can see the First and Last name and a list of his childs after. Is it possible to do this with your WebTextEditor