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<?xml version="1.0" encoding="UTF-8"?>
<helpdocument version="1.0">
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<meta>
<topic id="textsbasicshared03102600xml" indexer="include">
<title id="tit" xml-lang="en-US">IsNull Function [Runtime]</title>
<filename>/text/sbasic/shared/03102600.xhp</filename>
</topic>
</meta>
<body>
<section id="isnull">
<bookmark xml-lang="en-US" branch="index" id="bm_id3155555"><bookmark_value>IsNull function</bookmark_value>
<bookmark_value>Null value</bookmark_value>
</bookmark>
<paragraph role="heading" id="hd_id3155555" xml-lang="en-US" level="1" l10n="U" oldref="1"><link href="text/sbasic/shared/03102600.xhp" name="IsNull Function [Runtime]">IsNull Function [Runtime]</link></paragraph>
<paragraph role="paragraph" id="par_id3146957" xml-lang="en-US" l10n="U" oldref="2">Tests if a Variant contains the special Null value, indicating that the variable does not contain data.</paragraph>
</section>
<paragraph role="heading" id="hd_id3150670" xml-lang="en-US" level="2" l10n="U" oldref="3">Syntax:</paragraph>
<paragraph role="paragraph" id="par_id3150984" xml-lang="en-US" l10n="U" oldref="4">IsNull (Var)</paragraph>
<paragraph role="heading" id="hd_id3149514" xml-lang="en-US" level="2" l10n="U" oldref="5">Return value:</paragraph>
<paragraph role="paragraph" id="par_id3145609" xml-lang="en-US" l10n="U" oldref="6">Bool</paragraph>
<paragraph role="heading" id="hd_id3149669" xml-lang="en-US" level="2" l10n="U" oldref="7">Parameters:</paragraph>
<paragraph role="paragraph" id="par_id3159414" xml-lang="en-US" l10n="U" oldref="8">
<emph>Var:</emph> Any variable that you want to test. This function returns True if the Variant contains the Null value, or False if the Variant does not contain the Null value.</paragraph>
<paragraph role="paragraph" id="par_idN1062A" xml-lang="en-US" l10n="NEW">
<emph>Null</emph> - This value is used for a variant data sub type without valid contents.</paragraph>
<embed href="text/sbasic/shared/00000003.xhp#errorcode"/>
<embed href="text/sbasic/shared/00000003.xhp#err5"/>
<paragraph role="heading" id="hd_id3153381" xml-lang="en-US" level="2" l10n="U" oldref="9">Example:</paragraph>
<paragraph role="paragraph" id="par_id3154140" xml-lang="en-US" l10n="U" oldref="10">Sub ExampleIsNull</paragraph>
<paragraph role="paragraph" id="par_id3145172" xml-lang="en-US" l10n="U" oldref="11">Dim vVar As Variant</paragraph>
<paragraph role="paragraph" id="par_id3144760" xml-lang="en-US" l10n="U" oldref="12">msgbox IsNull(vVar)</paragraph>
<paragraph role="paragraph" id="par_id3153970" xml-lang="en-US" l10n="U" oldref="13">end sub</paragraph>
</body>
</helpdocument>
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