How to use errorprovider control to validate a textbox

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Let's say you have a form with textbox control, textbox1. Place an errorprovider control on the form (it is not a visible control).

In the textbox "leave" event, you can drop the following code to validate it for null value:

 if text1.text ="" then errorprovider.seterror (textbox1,"Data should not be blank") else 'clear the error description errorprovider.seterror(textbox1,"") end if

An icon will blink at the right side of the control when validated incorrectly.