How to check if an object is not of a particular type?

Question

I want to check if an object is not of a particular type. I know how to check if something is of a particular type:

if (t is TypeA) {    ... } 

but

if (t isnt TypeA) {    ... }    

doesn't work.

Answer 1

UPDATE 2020-10-30:

Times are changing. Starting from C# 9.0 you can use more natural way of checking it:

if(t is not TypeA) { ... } 

ORIGINAL ANSWER:

C# is not quite natural language ;) Use this one

if(!(t is TypeA)) {    ... }