If not properly protected, user input can cause problems because users may be able to interject their own SQL commands into the application and cause havoc with your database(s) – modifying or even deleting sensitive or crucial data.
In this tutorial, we will look at ways we can prevent the user from doing this.
A network link to a server might fail just as you're transferring data.
Or perhaps you simply didn't allow for a particular rare circumstance in your code. NET Framework offers a robust set of tools for dealing with these unexpected problems.
In a perfect world, your code would run correctly every time.