I have some auto-instantiation code which I would like to apply to about 15 properties in a fairly big class. The code is similar to the following but the type is differ
You could use the much overlooked T4 (Text Template Transformation Toolkit) to generate the code. It is included with Visual Studio 2008.
There was a 2009-06 .NET Rocks episode about it: "Peter Vogel uses Code Generation".