What is it called when several conditional code blocks are inside each other?

Question

I cant for the life of me remember what the word is. It's when you ???? several if/else/for/while/usings inside each other.

   bool isTrue = true, isFalse = true, HasForgottenWord = true;

   if( isTrue )
   {
      if( isFalse )
      {
          if( HasForgottenWord )
          {
              Console.WriteLine("Ask on StackOverflow.com - kthx bye");
          }
      }
   }

Edit: Thank you all!

Answer 1

It is called: bad

Answer 2

It's called nesting

Answer 3

Its called "nesting" them :)

Answer 4

nested maybe what you're looking for.

Answer 5

I think nesting might be what he's looking for...

Answer 6

... right: It's called nesting and deep nesting is generally considered a code smell.

Loop block nesting can be reduced by the Linus-Torvalds-Trick (see Mono Coding Guidelines).

Answer 7

It is called as nesting loops