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issues when running IIS as 64 bit


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I had a .net 2.0 web app that was using an interop assembly (references chartfx) .  This assembly is used in some pages to generate chart images.  This was working well when IIS was running in 32 bitmode.  Now we are migrating to native 64 bit and are facing issues with these pages that use charting.  I get the following error:


System.Runtime.InteropServices.COMException (0x80040154): Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG))

at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)

at System.EnterpriseServices.Thunk.Proxy.CoCreateObject(Type serverType, Boolean bQuerySCInfo, Boolean& bIsAnotherProcess, String& uri)

at System.EnterpriseServices.ServicedComponentProxyAttribute.CreateInstance(Type serverType)

at System.Runtime.Remoting.Activation.ActivationServices.IsCurrentContextOK(Type serverType, Object[] props, Boolean bNewObj)

Is there a way to get this to work for 64 bit ?


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No. No unmanaged DLL works on both 32-Bit and 32-Bits. We have 32-Bit and 64-Bit versions of Chart FX 6.2 that share the same codebase. So you can use each one on each environment.

More information here:


"On 64-bit Windows, 32-bit processes cannot load 64-bit DLLs, and 64-bit processes cannot load 32-bit DLLs. If you plan to run 32-bit applications on 64-bit Windows, you must configure IIS to create 32-bit worker processes"

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