Try this

http://www.codeproject.com/dotnet/wiascriptingdotnet.asp

I worked for me, although make sure you read the comments at the bottom of
the page, because there was a bug in the source code.  I've put the post
about the bug here to save you the trouble....

HTH, John

             Correction to sample code   DavidDavison  4:20 2 Nov '03

             I suggest a correction to the NetMaster's code.

                       foreach( object wiaObj in wiaDevs )
                       {
                       devInfo = (DeviceInfoClass)
Marshal.CreateWrapperOfType( wiaObj, typeof(DeviceInfoClass) );

                       //Marshal.ReleaseComObject( wiaObj ); <- MOVE THIS

                       if( devInfo.Type.IndexOf( "Video" ) > 0 )
                       {
                       foundID = devInfo.Id;
                       foundCount++;
                       }

                       Marshal.ReleaseComObject( wiaObj ); // <- TO HERE

                       Marshal.ReleaseComObject( devInfo ); devInfo = null;
                       }

                       I have found that the devInfo you have just
marshalled is released before you can use it to check the type.

                       Other than that, Nice one NetMaster!