How to use errorprovider control to validate a textbox

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.

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