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I've read something about Validating Events, but I am not sure how can I use them. Validating Event 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.

Active Control property to the current form, focus events occur in the following order Enter Got Focus Leave Validating Validated Lost Focus When you change the focus by using the mouse or by calling the Focus method, focus events occur in the following order: Enter Got Focus Lost Focus Leave Validating Validated event provides the hook to perform the validation and Error Provider gives a nice consistent approach to providing the user with feedback on any error conditions.

The following code example uses the derived class Text Box and validates an e-mail address that the user enters.

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Even if you want to extend your own validation, I would think that starting with a Masked Text Box would be a good start.

General comments: Don't need to instantiate the often unused variable 'X'.

Note: In the modified sample, I have implemented only 3 text boxes : the "Normal Validation" side. Mahmoud, Interesting solution I won't cover some valid points made above (there is room for this beside masked text boxes which have their own limitations & exceptions in something like this with a user interface aren't expensive - the user will spend some time interpreting the feedback anyway.) You do assume though that only method of entry is keypress - if so you should handle this with the on keypress event - for full validation on textchanged, you should note that the text may also be changed programatically; or by the user pasting a number in.

In these cases the Selection Start will not be in the correct place, so you would need another method.

I think it is interesting to discuss how existing standard solutions work, how they might be implemented or improved upon, but I think it is in general better to stick with the existing solutions until you can come up with a significantly better version.

It would strengthen your case to explain what problems you did have with the Regular Expression validator, for example.

I have some code that checks and makes sure that when the users enters in the field an integer from 1 - 10 has to be input.

Although if the users takes focus of the field, the "bad" data (such as "fdgfdg") is still left in the field.

This example requires that a Text Box and Error Provider control have been created on a form.

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