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# IsNull Function

Tests if a Variant contains the special Null value, indicating that the variable does not contain data.

Returns True when an object variable is passed that does not refer to a valid object, such as a newly created object that has not yet been assigned or an object assigned to the Nothing literal.

## Syntax:

    IsNull (Var)

## Návratová hodnota:

Boolean

## Paremetre:

Var: Premenná, ktorú chcete overiť. Ak Variant obsahuje hodnotu Null, funkcia vráti True, inak vráti False.

Null - Tato hodnota sa používa na vyjadrenie neplatnej hodnoty.

### Error codes:

5 Neplatné volanie procedúry

## Príklad:

    Sub ExampleIsNull
    Dim vVar As Variant
        MsgBox IsNull(vVar)
    End Sub

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