when I create an activeX control at runtime which in fact is a .net control exposed as a com object, the hosting axhost class gets the following exception during its dispose:

The object's type must be __ComObject or derived from __ComObject.
Parameter name: o

When the activeX control is created by other means (e.g. visual basic 6.0) the dispose works fine.

The control is created by callingnew AxHost(CLSID_OF_THE_CONTROL)

Is the .net control missing any necessary interface implementation to work with axhost?

System.ArgumentException was unhandled by user code
Message="The object's type must be __ComObject or derived from __ComObject.\r\nParameter name: o"
Source="mscorlib"
ParamName="o"
StackTrace:
at System.Runtime.InteropServices.Marshal.FinalReleaseComObject(Object o)
at System.Windows.Forms.AxHost.ReleaseAxControl()
at System.Windows.Forms.AxHost.TransitionDownTo(Int32 state)
at System.Windows.Forms.AxHost.DisposeAxControls()
at System.Windows.Forms.Control.DisposeAxControls()
at System.Windows.Forms.Control.Dispose(Boolean disposing)
at System.Windows.Forms.ContainerControl.Dispose(Boolean disposing)
at System.Windows.Forms.Form.Dispose(Boolean disposing)
at System.ComponentModel.Component.Dispose()
at System.Windows.Forms.Application.ThreadWindows.Dispose()
at System.Windows.Forms.Application.ThreadContext.DisposeThreadWindows()

It might by unusual, anyway AxHost should be able to handle all ActiveX controls. Instantiating it works fine, just the dispose is the problem (unfortunatley thisis a showstopper as the window is not closing anymore after this exception)

I don't have a wrapper as the activeX control is created dynamically during runtime, so the only thing I have is the CLSID, which is used to construct the AxHost object

Thats not the desired solution, as I want to be in principle independent of the activeX control. The interfaces shall be retrieved using reflection, not using a wrapper.

On the other hand AxHost is capable of disposing an activeX control which was build for instance with Visual Basic 6.0.