I looked it up on Wikipedia. You may have overlooked the fact that MS abandoned this project and that it used assembler, C and C++ to build the foundations. So

I looked it up on Wikipedia. You may have overlooked the fact that MS abandoned this project and that it used assembler, C and C++ to build the foundations. So the exercise has shown that it is possible, albeit with a considerable amount of non-C# code. But I think they also learnt that it isn't a particularly effective. There isn't enough information on Midori, the "commercial" successor to Singularity to make any assessment.