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Blank To Null Function
Convert Values Class

Public Function BlankToNull( _
    ByVal vValue As Variant _
    ) As Variant

Replace an empty string with a Null value.
Leave all other types of values unchanged.

Examples: 
    IsNull(BlankToNull("")) = True
    IsNull(BlankToNull(Null)) = True
    IsNull(BlankToNull("Word")) = False
    IsNull(BlankToNull(45)) = False
See also: 
    BlankToValue Function
    NullValue Property
vValue: The value which is to be changed from an empty string to a Null if appropriate. Function returns Null if vValue is an empty string. Function returns vValue unchanged in all other cases.

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