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Validation is often placed in a class by itself where it can be updated without updating the whole system.In the case of a Zip Code, validation could be as simple as checking to be sure that the input is a number, or it could be as complex as comparing the entered code with one derived from a GIS search.Microsoft calls this "implicit validation" because the events are fired "implicitly" by . Microsoft refers to coding a call to the Validate or Validate Children method as "explicit validation". Writeline is the fastest and easiest way to check whether that actually happens.--------Click Here to display the illustration--------There are two 'explicit' validation methods:-Validate Children Both have two overloads. The Validate Method You might think that you can trigger the execution of the Validating or Validated events by calling Validate from, for example, a Button, but you can't.What Microsoft calls "implicit" validation is used most often. Write Line("Text Box1 Validated") End Sub Your validation code ... When Auto Validate is set to Disable, calling Validate does nothing, even though it might appear to 'work'.--------Click Here to display the illustration--------In this case, there are two ways to trigger the execution of the Validating and Validated events.The first article covers that and the groundwork of validation in general. Write Line("Text Box1 Validating") End Sub Private Sub Text Box1_Validated( By Val sender As Object, By Val e As System. for example, checking to see if a phone number is in the correct format ... In an especially complex situation, you might use both. The first is to call Validate from the event subroutine handling the event.
The first Quick Tip Validation Guide defined validation as "the process of checking whether entered data is what it needs to be for the system to work correctly." And I noted in that article that: Windows form controls that have a Causes Validation property can fire a whole family of events when the focus shifts from the control.
It's an old fashioned debugging technique, but it really helps me in this particular case. Here's Validate Children responding to a button click.--------Click Here to display the illustration--------Validate Children is also more powerful because you can pass a parameter based on the Validation Constraints enumeration that limits which controls will actually trigger an evaluation.
The values can even be combined with a bitwise OR operation which actually results in a logical AND operation between the individual values.
A slightly negative aspect of validating data on the user's computer is that the validation is performed via a script residing in the Web page. You only have two possible scripting languages that you can use on a user's computer: VBScript or Java Script.
Some resources also refer to Jscript (Microsoft) and ECMAScript (European Computer Manufacturer's Association), but these are both derivatives of Java Script.
In previous example you’ve seen required field validator.