Article ID: 810098 - View products that this article applies to.
Caution ADO and ADO MD have not been fully tested in a Microsoft .NET Framework environment. They may cause intermittent issues, especially in service-based applications or in multithreaded applications. The techniques that are discussed in this article should only be used as a temporary measure during migration to ADO.NET. You should only use these techniques after you have conducted complete testing to make sure that there are no compatibility issues. Any issues that are caused by using ADO or ADO MD in this manner are unsupported. For more information, see the following article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/840667/ )You receive unexpected errors when using ADO and ADO MD in a .NET Framework application
On a computer that has Microsoft .NET Framework 1.0 installed (and that does not have Microsoft Visual Studio .NET installed), when you try to access data using ADO Interop on an ASP.NET page that resides at an identical site and that is hosted on the same computer, you may receive the following error message:
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
To resolve this problem, register the Adodb.dll file in the global assembly cache (GAC). On a computer where only the .NET Framework is installed, the file Gacutil.exe does not exist.. Either obtain the gacutil file by installing Microsoft .NET Framework SDK, or create a Visual Studio.NET setup project that uses the installer to install the correct components.
To register Adodb.dll in the GAC, follow these steps:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.
Steps to Reproduce the Behavior
For more information about registering .dll files in the GAC, visit the following Microsoft Web site: