BUG: Change CSharp example to be CSharp 2.0 compatible

Remove "var" declarations, and names argument specification to be
compatible with VS9 (2008) CSharp.

Change-Id: I470788dee4d8c4492cf0a1a71c6d6818fb9ad2fd
Merge topic 'SIMPLEITK-457_AddSharpGetBufferExample' into next

2071aec9 BUG: Change CSharp example to be CSharp 2.0 compatible