Vb net validating close
Each control that accepts free-form user input has a Validating event that will occur whenever the control requires data validation.In the Validating event-handling method, you can validate user input in several ways.Why does Microsoft recommend this approach in the article on "User Validation in Windows Forms"? Auto Validate = auto Validate Setting End If End Sub I found another way to implement this solution First you declare a public property called b Form Closing as a Boolean = false then you include this Boolean in your validation code with an AND like AND b Form Closing = false then here you use Error Provider. Cancel = false AND will disable the validation and allow you to close the form of all the controls validating events.( 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.Of course, there was lots of more cool features involved but for the sake of this post I'll keep it simple.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.
When users enter data into your application, you may want to verify that the data is valid before your application uses it.
Validation is very useful when you have bound your controls to a data source, such as a database table.
By using validation, you can make sure that your control's data satisfies the format required by the data source, and that it does not contain any special characters such as quotation marks and back slashes that might be unsafe.
For example, if you have a text box that must contain a postal code, you can perform the validation in the following ways: The Validating event is supplied an object of type Cancel Event Args.
If you determine that the control's data is not valid, you can cancel the Validating event by setting this object's Cancel property to .
You may require that certain text fields not be zero-length, that a field be formatted as a telephone number or other type of well-formed data, or that a string not contain any unsafe characters that could be used to compromise the security of a database.
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