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Long Data Type (Visual Basic)

Holds signed 64-bit (8-byte) integers ranging in value from -9,223,372,036,854,775,808 through 9,223,372,036,854,775,807 (9.2...E+18).

Use the Long data type to contain integer numbers that are too large to fit in the Integer data type.

The default value of Long is 0.

Programming Tips

  • Interop Considerations. If you are interfacing with components not written for the .NET Framework, for example Automation or COM objects, remember that Long has a different data width (32 bits) in other environments. If you are passing a 32-bit argument to such a component, declare it as Integer instead of Long in your new Visual Basic code.

    Furthermore, Automation does not support 64-bit integers on Windows 95, Windows 98, Windows ME, or Windows 2000. You cannot pass a Visual Basic Long argument to an Automation component on these operating systems.

  • Widening. The Long data type widens to Decimal, Single, or Double. This means you can convert Long to any one of these types without encountering a System.OverflowException error.

  • Type Characters. Appending the literal type character L to a literal forces it to the Long data type. Appending the identifier type character & to any identifier forces it to Long.

  • Framework Type. The corresponding type in the .NET Framework is the System.Int64 structure.

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