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Consistent use of these techniques will help make your applications more robust and reliable.When an application encounters an unexpected situation (such as a missing file or input parameter) or a logical error (performing a division-by-zero operation, for example), by default the application will terminate and generate an error display like the one shown in Figure 3.1. NET displays an error message and terminates the application when any error occurs. Use this event to perform validation on all the values of a row.Hi Jarod, To validate a user's input, use the Grid View's Validating Editor event.A good user interface will validate user input to ensure it is in the correct format.This may come in the form of simply checking if there is an entry for a field, such as a name or a more complex task such as validating an email address.Use this event to provide custom validation for any input control, such as a Text Box. In other words, the validating control will retain the focus until the user provides the correct format, even if the user clicks another control such as a button or textbox.
Each control has the following events and properties that are used to validate a form. Validation on a control is triggered when the control loses focus. Cancel Event Args] object as a parameter to the event block, which you can access this by using the in the Validating event, all events that would usually occur after the Validating event are suppressed.
Important: Never attempt to set the Focus of a control in this event because it can cause the script to hang.
This event occurs when the control is finished validating.
A network link to a server might fail just as you're transferring data.
Or perhaps you simply didn't allow for a particular rare circumstance in your code. NET Framework offers a robust set of tools for dealing with these unexpected problems.