System.Security.SecurityException: Dialogs must be user-initiated.

The Printing API in Silverlight 4 helps us a lot like printing the entire page, printing a specific portion of a page……

In order to get a quick idea on the print API do have a look at this(A look at the Printing API in Silverlight 4) article on silverlightshow.

While implementing this print API in my project I came across the following error in some scenarios.

“ System.Security.SecurityException: Dialogs must be user-initiated.”

This error message initially leads to lot of confusion and upon search found the cause. As all the developers do, I was debugging the code by putting breakpoint. The problem is I put the breakpoint over the line where the object initiation for PrintDocument happens. Something like……
 
 

 
So when the exception “ System.Security.SecurityException: Dialogs must be user-initiated.” got raised while using print API for Silverlight 4 in debug mode, ensure that you didn’t put breakpoint over the code that invokes the Print method.

REFERENCE

http://johnpapa.net/silverlight/printing-tip-ndash-handling-user-initiated-dialogs-exceptions/