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C validating textbox input

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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. The text box is used so that the user can input a clients rate of pay. Problem is I am still not familiar with how the characters are being used within the brackets.

For more information, see the WM_KILLFOCUS topic in the "Keyboard Input Reference" section, and the "Message Deadlocks" section of the "About Messages and Message Queues" topic in the MSDN library at 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.Each control that accepts free-form user input has a Validating event that will occur whenever the control requires data validation.It returns a Dialog Result to detect wheather the OK or the Cancel button has been clicked.The value can be obtained from the input/output parameter value.Regular Expression Regular Expressions are specially formatted strings for specifying patterns in text.