Validating event in c

15-Apr-2018 03:43

At this point the user is not allowed to cancel the performed changes, pressing the Esc key.

Using form events, you may modify information or fields at different steps of the workflow: from the population of the form to the submission of the data from the request.

You can display multiple error indications on a form at the same time using the same Error Provider control.

You can also display errors that occur in Data Sets.

We will ensure that the Age is mandatory, is in numeric format and the user is 18 years or older.

Validation in Action Figure: Validation Form Figure : Validation Errors Figure : Error message displayed in addition to the form error indicators.

Registering an event listener is very easy using the Form component.

In this example we will see how to use the Error Provider control in Windows forms to provide validations in Windows Forms and display user-friendly error messages to the user if the validation fails. Add controls as shown in the figure below and set the properties of the controls as indicated in the table.

When the validation fails, the editor is closed, but the user cannot change the current row in the grid until a valid cell value is entered.

In this situation the editor is not kept active when the validation fails and pressing the Esc key does not revert the changes as the editor is already closed.

Validation in Action Figure: Validation Form Figure : Validation Errors Figure : Error message displayed in addition to the form error indicators.Registering an event listener is very easy using the Form component.In this example we will see how to use the Error Provider control in Windows forms to provide validations in Windows Forms and display user-friendly error messages to the user if the validation fails. Add controls as shown in the figure below and set the properties of the controls as indicated in the table.When the validation fails, the editor is closed, but the user cannot change the current row in the grid until a valid cell value is entered.In this situation the editor is not kept active when the validation fails and pressing the Esc key does not revert the changes as the editor is already closed.Figure : Error Provider Sample The complete code listing is provided at the end of the sample. Figure : Sample Form Layout Table : Properties for Sample Form Layout Controls Now add a Error Provider control to the Form. Net, you can drag and drop the control from the toolbox. Please refer to the code listing provided at the end of the article.