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When users enter data into your application, you may want to verify that the data is valid before your application uses it.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.Windows Forms provides several ways for you to validate input in your application.If you need to require users to enter data in a well-defined format, such as a telephone number or a part number, you can accomplish this quickly and with minimal code by using the Masked Text Box control.

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Today End Sub End Class Public Class Courses Inherits Observable Collection(Of Course) Sub New() Me. Memberwise Clone(), Course) End Sub Public Sub Cancel Edit() Implements IEditable Object.

Begin Edit If in Edit Then Return in Edit = True backup Copy = CType(Me.

In the Validating event-handling method, you can validate user input in several ways.

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.