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How do i validate them, In certain text boxes I have to use only text and in some I have to use only numbers. There are multiple values to handle this: annoy them when they try to paste text from somewhere else. Is using ASCII is a right method or is there any easier method to do this. Private Sub Text Box1_Key Press(By Val sender As Object, By Val e As System. Imagine the following: I am trying to copy an number from a website. They are harder to understand but offer better performance. Which is easier if you don't know regex but is less performant. This could be a viable option, depending on how hard the validation is. If no validation group is specified, then no validation group is used. The following code example uses the derived class Text Box and validates an email address that the user enters. Length) ' Set the Error Provider error with the text to display. Set Error(text Box1, error Msg) End If End Sub Private Sub text Box1_Validated(By Val sender As Object, _ By Val e As System. Validated ' If all conditions have been met, clear the error provider of errors. Set Error(text Box1, "") End Sub When you change the focus by using the keyboard (TAB, SHIFT TAB, and so on), by calling the Select or Select Next Control methods, or by setting the Container Control. 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...
Text Box1, "This field does not accept negative values.") Me. It also has various other properties, but here's the bit which deals with validation.