Validating the expression of zero


03-Jun-2020 04:15

If you determine that the control's data is not valid, you can cancel the Validating event by setting this object's Cancel property to .If you do not set the Cancel property, Windows Forms will assume that validation succeeded for that control, and raise the Validated event.The explicit validation approach validates data at one time.You can validate the data in response to a user action, such as clicking a Save button or a Next link.By using validation, you can make sure that your control's data satisfies the format required by the data source, and that it does not contain any special characters such as quotation marks and back slashes that might be unsafe.When you use data binding, the data in your control is synchronized with the data source during execution of the Validating event.Windows Forms provides several ways for you to validate input in your application.

validating the expression of zero-59

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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.

When the user action occurs, you can trigger explicit validation in one of the following ways: However, in some cases, you might want to let the user close the form regardless of whether the values in the controls are valid.



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