Is it really necessary to export to a Personal Geodatabase (.mdb)? This format is really old and Esri recommends to move towards the File Geodatabase. I did find a "museum piece" of code based on VB6 that shows how to do this conversion. I'm sure you can port it to VB.Net: Copying a feature dataset from an ArcSDE geodatabase to a personal geodatabase
The question becomes, why are you having to use vb.net for older software, when there are builtin tools within the arc* suite that don't require any coding what-so-ever. Perhaps you can elaborate on why your focus is so limiting
Because i was developing add Inn application with certain tools and commands over arcmap and i want to develop add inn command in my toolbar that will help end user to export a layer to personal geodatabase or file geodatabase so user can use it in his work .. actually the end user are not a gis user who know how to work with ArcMap they want to click button to export map without any interaction from their side
