Migration from dasBlog to Blogengine.Net was quite easy. By using the BlogML format it's simple to move from one blogsoftware to another. Blogengine.Net supports BlogML out the box so the import was no problem.  For exporting the dasBlog posts to BlogML I used the dasBlog Import Tool from Paul von Brenk. After downloading the Import Tool just type

Importer.exe -e %path to dasBlog root% %Outputpath\Outputfile.xml%

to export the dasBlog Posts to a BlogML file. In the Blogengine.Net Settings you can use the Import Tool to Import the XML File and you're done.