I am trying to get an integrated mapping application working with Mapinfo 7.8 and VB.NET2005. I have created similar applications before with VB6 and MapInfo but I have been unable to get the callback function working with vb.NET. I have created a standard Windows project and a class containing the methods by which MapInfo notifies the calling program. In the main form I create a public instance of the class and call MapInfo's SetCallBack method with the instance as the argument. Although I can quite happily control MapInfo from the VB.NET program I get no response at all from actions in the MapInfo window. I have tried to implement some of the ideas that have appeared in MI-L but with no success.  I know I am not the only one with this problem. Does anyone know of any rules/steps that will lead to a successful implementation of the callback function? I find it hard to believe that MapInfo would provide this method without some clear-cut way of implementing it. Any advice would be appreciated.
 
David Hebblethwaite

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