How To Utilize No Data Message

Summary: The Utilization of "No Data Message " Property Pays difficult..Also Tried "Total Items Count" Which Shows the total count of Data in the table. Also I would like to describe how I made it possible..In VB Enter Event I configured a Rest Which Returns the data and the Data Count..And I created A Variable And I Mapped That Count to the newly Created Variable..But When I tried to make configure for "No Data Message" Property's fx as some Javascript expression, It was conflicted and hided the working state of "Total Items Count"..So What I need to do to