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For our Visual Basic applications, we will need to work a little harder to ensure that the input is valid, because we will need to define and code our own validation rules.In a software project of any size, the task of determining what valid data is usually undertaken long before any code is written, and is part of an initial requirements analysis phase.Text) - 1 If In Str(1, str Allowed Chars, txt Telephone.

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Nor can they guarantee that any data files used by the program will be free of errors and in the correct format.There are however measures that can be taken to restrict the program's input to valid data.For the alignment, sizing and spacing of the controls, use the Format icon on the toolbar.Validating textboxes in a control array is not much more difficult.Focus() exit sub End If Next End If The event handler starts with the declaration of a local character array variable called statement.

If the user has not entered anything at all, the code exits the subroutine (the problem of this being a mandatory field will be dealt with separately by the Submit button's event handler, should the field remain empty when the user tries to submit the form data).Although not explicitly stated below, you should also impose appropriate limits on the input length for the remaining fields.The password fields are a good example of a situation where you can reduce the requirements for data validation by imposing such a limit.Even so, we can think in general terms about the kind of data validation required for a typical application, and how it might be implemented.Some common data validation requirements are outlined below.Today, I will teach you how to validate a Textbox using an Error Provider in Visual Basic 2008.