And did they refuse the job because of D, low salary, not wanting to move to the Netherlands or some other reason? I could see a C++ dev giving this a try with

And did they refuse the job because of D, low salary, not wanting to move to the Netherlands or some other reason? I could see a C++ dev giving this a try without hurting their career prospects, but C# devs are not exactly known for trying out non-mainstream technologies. If they switch for a couple of years MS will pump out a couple of frameworks and .NET programming languages. Fire and motion as such.