Rather than comparing have you tried "is null"?

Hi,

Yes, I've tried "is null" expression, but it doesn't work...

Thanks!

Hi RM,

There may be times when retrieving a result set from a read SmatObject operation returns nothing, if this is possible in your scenario then you can use the IsEmpty property on the SmartObject class to check for null data.

Have a look at the following link from K2 blackpearl Developers Reference:

• 
  
• How to return data from a SmartObject
  

Hope this help

Kind Regards

Julia

If you have a control such as a Radio Button List control that is set/loaded with a value that the control was not populated with (not present/shown with other words), then wrapping the Radio Button List control in an expression can help detecting whether the control is blank/empty/null in a second expression.

1. Wrap the Radio Button Control control in an expression:
   Simply drag the Radio Button List control into a new expression e.g. called rblAsExp
2. Create a second expression with if-logic that checks whether the rblAsExp (expression) is blank/empty/null.