C# new question

Dear Genesys Gurus,

I am using GIS with C# and I have a question:

should I do:

DesktopToolkitX.TEventInfo teventInfo = new DesktopToolkitX.TEventInfoClass();

or

DesktopToolkitX.TEventInfo teventInfo = new DesktopToolkitX.TEventInfo();

I am not very clear on it.