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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.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.A is a string made up of characters from a masking language that specifies which characters can be entered at any given position in the text box. If the user types an incorrect entry, for example, the user types a letter when a digit is required, the control will automatically reject the input.Validation controls can be organized into groups that enable you to selectively enable or disable validation for related controls on a page.Other validation operations, such as displaying a method, can reference a specific validation group.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.

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Not all websites implement our on-site analytics and publish the results. Validation controls provide an easy-to-use mechanism for all common types of standard validation—for example, testing for valid dates or values within a range—plus ways to provide custom-written validation.Validation controls can be used with any both HTML and Web server controls.For these sites, we show estimated metrics based on traffic patterns across the web as a whole.

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We identify these patterns by looking at the activity of millions of web users throughout the world, and using data normalization to correct for any biases.Validating web forms is a critical skill for any web developer, ensuring that the data that's submitted is complete, accurate, and nonmalicious before it's sent off to the server.