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Variants of type VT_NULL are not mapped successfully to common language runtime reference types.
The common language runtime is supposed to pass a NULL reference to the function.
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that this article describes. Apply it only to systems that are experiencing this specific problem.
To resolve this problem, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:
Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question. The English version of this fix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.
Date Time Version Size File name -------------------------------------------------------------- 17-Jul-2003 23:34 1.1.4322.924 77,824 Corperfmonext.dll 17-Jul-2003 23:09 1.1.4322.924 311,296 Mscorjit.dll 17-Jul-2003 23:09 1.1.4322.924 2,093,056 Mscorlib.dll 17-Jul-2003 23:09 1.1.4322.924 2,498,560 Mscorsvr.dll 17-Jul-2003 23:09 1.1.4322.924 2,486,272 Mscorwks.dll
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates
When you pass NULL for a parameter in a script, such as a Microsoft VBScript or a Microsoft JScript, the scripting engines pass their parameters as VARIANTS of type VT_NULL. The common language runtime translates those variables to values of type System.DBNull, as documented. However, if the .NET method parameter is a reference type, the .NET method fails.