hello, can you help me..is it possible that i will change the default font of the messagebox?....can i make it bold or using any fon..please help me on this ...thanks in advance hoping for your positive responds.

you simply can not...a msgbox is a modal window that uses the standard windows system font.
you can manipulate it with use form as your message box..

With better english.... To do what you want would require you to subclass the message box, which is no easy thing, and then you may not be able to accomplish what you want. So, your only choice is to create a form that you can use as a message box by showing it modal...

Good Luck