Either generate RTF (which is a bit messy, but not that complex for simply stuff) or use the COM interface to control Word.

How are you accepting data in masked text box? You can convert the input into your format. For example you can say string.Format("{0:dd\MM\yyyy}",DateTime.Today.Date); If this does not make any sense, you will have to send me some code of yours :)

Set CauseValidation property of the "Close" Button to False Tirtha Miles to go before I sleep

Send the piece of code. As i guess, your textboxes are empty when the use clicks close(X sign on to Form Titlebar) validation fails because you validate if the text entered in the textbox is empty or not, if empty fail the validation which vauses form to give focus to this textbox back instead of closing.