bool IsValid(
	Object value
)

Function IsValid ( 
	value As Object
) As Boolean

Parameters

value

Type: SystemObject
The value.

Return Value

The method is called immediately when a value is written into a cell. Return false to prevent setting the value.

If value is null IsValid should always return true. Null value should be rejected by the BcfColumnNotNullConstraint only.

If IsValid() returns false an ArgumentException will be thrown. The Message property will also contain the IBcfColumnTypeConstraint objects ToString result.

Reference