This tip was submitted to the VS.NET Info Center by member Thomson Alexander. Please let other users know how useful it is by rating it below.
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.