Crystal Report within VB.Net

Hi,

I have crystal report letter which is populated with data from sql database.
In the database I have stored the signature of the user to a path location ie., for example E:\Signatures\Gerry.

Now, when the letters are generated in crystal I would like to have crystal read the path and extract the image from the folder Signatures and display it on the letters.

Please could someone tell me the procedure I'll achieve this..

Thanks