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Most often, the purpose of data validation is to ensure correct input to a computer application.Validation can be defined by many different methods, and deployed in many different ways.Server side validation is performed by a web server, after input has been sent to the server.

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I have some code that checks and makes sure that when the users enters in the field an integer from 1 - 10 has to be input.Although if the users takes focus of the field, the "bad" data (such as "fdgfdg") is still left in the field.So could some demonstrate how when focus is lost on the field, if the data is not valid, a default value will be entered instead e.g. Validating += new Cancel Event Handler(text Box1_Validating); void text Box1_Validating(object sender, Cancel Event Args e) { int number Entered; if (int. Text, out number Entered)) { if (number Entered if you are hand-rolling validation like you do here, all you need to do is to set the default value after you Message Box.I want to check what the user is writing in a textbox before I save it in a database. I guess I can always write some ifs or some try-catch blocks, but I was wondering if there's a better method.I've read something about Validating Events, but I am not sure how can I use them. Validating Event When you change the focus by using the keyboard (TAB, SHIFT+TAB, and so on), by calling the Select or Select Next Control methods, or by setting the Container Control.

Active Control property to the current form, focus events occur in the following order Enter Got Focus Leave Validating Validated Lost Focus When you change the focus by using the mouse or by calling the Focus method, focus events occur in the following order: Enter Got Focus Lost Focus Leave Validating Validated event provides the hook to perform the validation and Error Provider gives a nice consistent approach to providing the user with feedback on any error conditions.

though: The Error Provider component does not provide built-in support for accessibility clients.

To make your application accessible when using this component, you must provide an additional, accessible feedback mechanism.

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.