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If the e-mail address is not in the standard format (containing "@" and "."), the validation fails, an Error Provider icon is displayed, and the event is canceled.
This example requires that a Text Box and Error Provider control have been created on a form.
For more information, see the WM_KILLFOCUS topic in the "Keyboard Input Reference" section, and the "Message Deadlocks" section of the "About Messages and Message Queues" topic in the MSDN library at
The following code example uses the derived class Text Box and validates an e-mail address that the user enters.
Assuring the quality of an expert system is critical.
Inspection and demonstration is the main testing method used in Verification.The V&V results provide incremental assurance that the product will pass the customer’s criteria.Eventually these results provide proof that the product performs as specified, and provide an indication of how well the product will satisfy its operational needs. The utility runs a network benchmark program that transfers a 5 second stream of data from the current host to each remote host included in the test.By default, the data is transferred in parallel to each remote host and the minimum, maximum, average and median network transfer rates are reported in megabytes (MB) per second.