| VB6 Data Type | C# | Supported |
| Byte | byte | Yes |
| Boolean | bool | Yes |
| Integer | short | Yes |
| Long | int | Yes |
| Single | float | Yes |
| Double | double | Yes |
| Currency | double | Yes |
| Decimal | decimal | Yes |
| Date | System.DateTime | Yes |
| Object | object | Yes |
| String | string | Yes |
| String* fix-length | string | Yes |
| Variant | object | Yes |
| User-defined data type | struct | Yes |