I am having an (.mdb) file .I want to export this file to (.dgn) format .How can i do this in Qgis ? Is there any plugin available ?
Assuming your mdb is an ESRI Personal geodatabase, you can add it to your QGIS project with
Add vector layer.
Then you can save the layer(s) with
rightclick -> Save as to Microstation DGN format, with some limitations listed here: