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34<meta>
35<topic id="textsbasicshared03102600xml" indexer="include">
36<title id="tit" xml-lang="en-US">IsNull Function [Runtime]</title>
37<filename>/text/sbasic/shared/03102600.xhp</filename>
38</topic>
39</meta>
40<body>
41<section id="isnull">
42<bookmark xml-lang="en-US" branch="index" id="bm_id3155555"><bookmark_value>IsNull function</bookmark_value>
43<bookmark_value>Null value</bookmark_value>
44</bookmark>
45<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>
46<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>
47</section>
48<paragraph role="heading" id="hd_id3150670" xml-lang="en-US" level="2" l10n="U" oldref="3">Syntax:</paragraph>
49<paragraph role="paragraph" id="par_id3150984" xml-lang="en-US" l10n="U" oldref="4">IsNull (Var)</paragraph>
50<paragraph role="heading" id="hd_id3149514" xml-lang="en-US" level="2" l10n="U" oldref="5">Return value:</paragraph>
51<paragraph role="paragraph" id="par_id3145609" xml-lang="en-US" l10n="U" oldref="6">Bool</paragraph>
52<paragraph role="heading" id="hd_id3149669" xml-lang="en-US" level="2" l10n="U" oldref="7">Parameters:</paragraph>
53<paragraph role="paragraph" id="par_id3159414" xml-lang="en-US" l10n="U" oldref="8">
54<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>
55<paragraph role="paragraph" id="par_idN1062A" xml-lang="en-US" l10n="NEW">
56<emph>Null</emph> - This value is used for a variant data sub type without valid contents.</paragraph>
57<embed href="text/sbasic/shared/00000003.xhp#errorcode"/>
58<embed href="text/sbasic/shared/00000003.xhp#err5"/>
59<paragraph role="heading" id="hd_id3153381" xml-lang="en-US" level="2" l10n="U" oldref="9">Example:</paragraph>
60<paragraph role="paragraph" id="par_id3154140" xml-lang="en-US" l10n="U" oldref="10">Sub ExampleIsNull</paragraph>
61<paragraph role="paragraph" id="par_id3145172" xml-lang="en-US" l10n="U" oldref="11">Dim vVar As Variant</paragraph>
62<paragraph role="paragraph" id="par_id3144760" xml-lang="en-US" l10n="U" oldref="12">msgbox IsNull(vVar)</paragraph>
63<paragraph role="paragraph" id="par_id3153970" xml-lang="en-US" l10n="U" oldref="13">end sub</paragraph>
64</body>
65</helpdocument>
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