Open DataReader Connection

I'm having trouble accessing database information from a custom service class I created. Whenever I run the project and try to access the page with the service I created, an error message appears: There is already an open DataReader associated with this Connection which must be closed first . Has anyone experienced this and managed to resolve it?

Hey @ANTONIO_MANTENTE,

Please use StackOverflow for questions not related to Radzen products.

I'm really using RadZen.