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This is why I decided to make use of Regular Expressions here within this article.
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.
The control also works well when bound to a data source.
The Format event on a data binding can be used to reformat incoming data to comply with the mask, and the Parse event can be used to reformat outgoing data to comply with the specifications of the data field. If you want full programmatic control over validation, or need to perform complex validation checks, you should use the validation events built into most Windows Forms controls.