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There are however measures that can be taken to restrict the program's input to valid data.Such measures involve the application of to any data being input to the program. input that does not obey the validation rules) can be dealt with in a pre-defined way, and will not cause the program to crash or produce spurious output.The idea is that a human being will be able to solve a relatively easy arithmetic problem whereas a robotic program would not even recognise it as such (in a real-world implementation the sum would not only be randomly generated, but would be presented as a slightly distorted or noisy image in order to prevent an intelligent robot from being able to decipher the question).Note also that the two password text boxes should have their event, which will check the form data for validity before sending it to the (in this case imaginary) server application.In its broadest sense, the concept applies to anything that the application does to ensure that data entered by the user is acceptable for the purposes of the application.Input validation can take place at various times in the data entry cycle.Some common data validation requirements are outlined below.
That means the first control where you entered the data lost the input focus, and the other control is about to receive the focus.For example, the programmer can: The first subobjective for this chapter, verifying data entered by a user at the field level and the form level, deals mostly with the immediate validation of user input from the keyboard.In order to cover this objective, we discuss the three main Keystroke events, Key Up, Key Down, and Key Press.To demonstrate some simple validation techniques, we will create a data entry form of the type typically found on a web page.Proceed as follows: Name: lbl Password Note Auto Size: False Font: Microsoft Sans Serif, 10pt Location: 603, 269Size: 261, 53Text: "Note: "Password must be between six and sixteen characters in length and contain only letters and numbers"Text Align: Middle Right) is often used to describe this kind of validation.
The password fields are a good example of a situation where you can reduce the requirements for data validation by imposing such a limit.