How to catch error message and show it in VC?

I want to catch the error message and show it in VC.For example, if there is no data row in table view queryed from data service, then popup a window to show the message "No Data Found".I don't konw how to implement it!

Hello Kane
use expression{disble this after defining erroe messege} box in that popup there u can define your own message as error or warning accordingnly it display message
I hope it work or Let me know it
Regards
````Satish````

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