You got to the point of using the Validator. Run your form, and when you enter an invalid value in the TextBox, it will show an error message. You click the "Submit" button, it will not close the window while there are still errors. For a full demo, I have got a "register" example for you, please analyse it yourself. If you have any problems, feel free to contact me. Points of Interest In this section, I want to say more about advanced components programming. It will be a guide to people who are interested in my Validator component and will show the key points of the Validator.
password validation in c# windows applicationYou 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. Validation with the MaskedTextBox Control 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 MaskedTextBox control.
winforms validation best practices
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