Why can't I pass List as a parameter to a method that accepts List<object>?

Question

The following code gives me this error:

Cannot convert from \'System.Collections.Generic.List\' to \'System.Collections.Generic.List\'.

Answer 1

C# (at present) does not support variance for generic types.

However, if you're using C# 3.0, you can do this:

FillSmartGrid( customers.Cast