What are the functional bugs applicable in the .NET Application?

It don't support addslashes. Thus creating run time error...

The obvious answer is when a particular functionality does not work,then it becomes a functional defect. For eg. When a wrong date can be entered for eg.when only today's date can be entered and system allows to enter any past or future date,then is is a functional defect. Another example would be when the system crashes (a show stopper) that would be a functional bug.

Yes, if any functionality doesn't work at all we can say..it is a functional defect.

Ex: If any field doesn't accepts right inputs or if it gives incorrect validations

@sarega99: Are there any bugs which are very typical to a .net application.
The answers are very generalized and can be applied to any application.