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An "Object reference not set to an instance of an object" error occurs when you try to access data by using ADO Interop on an ASP.NET page

Posted by Larry Bargers at 5:18 PM

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:
  1. Click Start and then click Run.
  2. In the Run dialog box, type the following command, and then click OK:
    C:\WINDOWS\Microsoft.NET\Framework\v1.0.3705\gacutil /i C:\Program Files\Microsoft.NET\Primary Interop Assemblies\adodb.dll

 

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