classic asp get var type
type = VarType(param)
+--------------+-------+---------------------------------------------+
| Constant | Value | Description |
+--------------+-------+---------------------------------------------+
| vbEmpty | 0 | Empty (uninitialized) |
| vbNull | 1 | Null (no valid data) |
| vbInteger | 2 | Integer |
| vbLong | 3 | Long integer |
| vbSingle | 4 | Single-precision floating-point number |
| vbDouble | 5 | Double-precision floating-point number |
| vbCurrency | 6 | Currency |
| vbDate | 7 | Date |
| vbString | 8 | String |
| vbObject | 9 | Automation object |
| vbError | 10 | Error |
| vbBoolean | 11 | Boolean |
| vbVariant | 12 | Variant (used only with arrays of Variants) |
| vbDataObject | 13 | A data-access object |
| vbDecimal | 14 | Decimal Value |
| vbByte | 17 | Byte |
| vbLongLong | 20 | LongLong integer (64 bit) |
| vbArray | 8192 | Array |
+--------------+-------+---------------------------------------------+