Vb 2016 validating text box

You can use it to make sure that the user has entered something in a Text Box control.Let's give it a try, and add a Required Field Validator to our page.Browser support[^] is pretty good, with the exception of IE9 and earlier.And if you still want to use script, it would be better to use a Regular Expression Validator control[^].Right now, the button does nothing, besides posting back if the page is valid.We will change this by adding an onclick event to it: As you will notice, we check whether or not the page is valid, before we do anything.I'm sure that all the attributes of the controls makes sense by now, so I won't go into details about them. You should see something like this: If your browser supports Java Script, which most modern browers do, then you will notice that the page is not being posted back to the server - the validation is performed clientside! To see how it feels, you can add enableclientscript="false" to the Required Field Validator and try again.

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try this valid email address with your Reg Ex validator and you will see that your regex will tell you the email address is not [email protected] the RFC 5322 documentation for further details.

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