Why can't we declare var a = new List at class level?

Question

I know we cannot do this at class level but at method level we can always do this.

var myList=new List // or something else like this
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Answer 1

The var keyword was invented specific to support anonymous types. You are generally NOT going to declare anonymous types at the class level, and thus it was not implemented.

Your example statement

var myList=new List

is not a very good example of how to use the var keyword since it's not for the intended purpose.