Expressions allow you to add more functionality to your Kushal Application. In Expression, not only can you call predefined functions, but also add more functionality to your application by referencing external DLLs.
To add a DLL file, select the respective form and Click Expressions button.
Click Other Tab and then click Add References button in Reference Tab.
Select the DLL file from the system
In the DLL Window, you can see the Selected DLL file.
Then you can use the DLL functions in Expressions that you build.