The AllowLength property exposes the ability to qualify a data type using a length parameter.
object.AllowLength
object
Expression that evaluates to an object in the Applies To list
Boolean
Read-only
HRESULT GetAllowLength(LPBOOL pRetVal);
AllowLength is TRUE for data types that accept a length qualification. For example, the property is TRUE for the SystemDatatype object referencing the varchar data type.