In this chapter, we'll look at two facets of dealing with problems in . First, we'll demonstrate the programming that you can do to handle errors, allowing the user to make corrections when something goes wrong.
Then, we'll demonstrate how you can use validation techniques to prevent bad data from being entered into your application in the first place.
( Unless I'm reading it wrong, it describes the problem exactly, but the solution doesn't work. Remember to set to false the Causes Validation = false of the exit button Also you can put it in the mouse down even or Closing Form Event, any event that triggers before the validating event. IT is so annoying working with MS buggy implementation.
You will first see the programming you can use to handle errors, and then you will see how to use validation techniques to prevent bad data from being entered into your application in the first place.
If you don't validate input, your application can represent a serious security hole on the system.
As per my mock up to the left, my best case scenario was to start users in the Text Box control and have them to type in a value and tab to the Combo Box control.
In this chapter I'll discuss the various techniques you can use to validate data and maintain the integrity of your application.
This isn't just a matter of ensuring that your application delivers the proper results.
The code I chose to implement the above scenario involved the Validating & Validated events: However, all I wanted to do was exit the form in the first place and not spend the extra cycles querying the database or making things happen on the form before closing.