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This article discusses how to validate information you get from users — that is, to make sure that users enter valid information in HTML forms in an ASP. What you'll learn: If you ask users to enter information in a page — for example, into a form — it's important to make sure that the values that they enter are valid.
Private Sub txt Validating(sender As Object, e As System. Therefore, you also have to make sure that the values that users enter can be correctly converted to the appropriate data types.You might also have certain restrictions on the values. Key Press Dim allowed Chars As String = "0123456789" If allowed Chars. Regardless of the plat form, you should look into the validation controls offered by the framework, and that will allow you to validate that there is indeed input, values are in a specified range, and also using regex write more complicated validation rules. If I’m typing some text and the application prevents that (regardless of how it does that), I’m rightfully pissed off.
Handled = True End If End Sub NOTE: This code sample is assuming Win Forms, different approach must be used for web...
They are harder to understand but offer better performance. Which is easier if you don't know regex but is less performant.