Given that in .NET it is easy to write your own language these could be used to plug obvious holes in the mainstream languages. For example C# makes a pigs ear of it’s constructors.
The minimal syntax is

C () : base () { }

It is possible to have more code in the base () parameters than in the implementation itself.

You need to redefine any constructors that are required in a descendant class.
This makes the definition of mostly empty classes such as exception hireachies far more work than is actually needed.

Delphi has trivial to implement Exceptions :

type
   EBaseException = class(Exception);

  EMyException = class(EBaseException);

This makes their definition and use so useful.

I am wondering if it is possible to create an Exception Definition Language to ease this issue?
I will Blog about this experiment later.

This is the first article in the blog comparing Delphi features to C#.
C# is a great language but is missing some incedibly useful features from Delphi.

In Delphi you can declare an enumeration as

TEnumColour = (Red, Green, Blue);

You can then declare an array over that enumeration:

TWaveLength : array[TEnumColour] of integer  = (100,200,300);

This is a very powerful technique for ensuring that an enumeration always has valid data.

I have yet to work out how to do this in C#