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.



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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