These are the values of the properties in List events:
| List | BeforeProperties | AfterProperties | properties.ListItem |
| ItemAdding | No Value | No Value | Null |
| ItemAdded | No Value | No Value | New Value |
| ItemUpdating | Original Value | Changed Value | Original Value |
| ItemUpdated | Original Value | Changed Value | Changed Value |
| ItemDeleting | No Value | No Value | Original Value |
| ItemDeleted | No Value | No Value | Null |
And here are the properties available in Library events:
| Library | BeforeProperties | AfterProperties | properties.ListItem |
| ItemAdding | No Value | No Value | Null |
| ItemAdded | No Value | No Value | New Value |
| ItemUpdating | Original Value | Changed Value | Original Value |
| ItemUpdated | Original Value | Changed Value | Changed Value |
| ItemDeleting | No Value | No Value | Original Value |
| ItemDeleted | No Value | No Value | Null |
Hope this helps! 
