[MSDN Library June 1998] IsNull (86.3636363636364%)

MSDN Library Visual Studio 6.0 > Tools and Technologies > Windows CE Toolkit for Visual Basic 5.0 > Windows CE Toolkit for Visual Basic 5.0 > Windows CE Toolkit for Visual Basic 5.0 Help > Language Reference > Functions

[MSDN Library June 1998] IsNull Property (26.2419871794872%)

MSDN Library Visual Studio 6.0 > Platform SDK > Setup and Systems Management Services > Windows Installer Programmer's Reference > Installer Package Programmer's Reference > Automation Interface > Automation Interface Reference > MsiRecord Object

[MSDN Library June 1998] IsNull Function (24.9156371012355%)

MSDN Library Visual Studio 6.0 > Microsoft Office Development > Office 97 Documentation > Office > Microsoft Office 97/Visual Basic Language Reference > Volume 5 > Microsoft Visual Basic for Applications Language Reference

[MSDN Library June 1998] IsNull Function (22.4156545209177%)

MSDN Library Visual Studio 6.0 > Microsoft Office Development > Office 95 Documentation > Excel > Microsoft Excel/Visual Basic Reference > A-Z Reference

[MSDN Library June 1998] ISNULL( ) Function (22.1631701631702%)

MSDN Library Visual Studio 6.0 > Visual FoxPro Documentation > Reference > A to Z Language Reference