Array initialization without the keyword "new"

Question

In C# it is possible to initialize an array without the keyword "new" like in the following example:

int[] x = { 10, 20, 30 };

Does this mean that the array will be initialized on the stack since the keyword "new" is necessary to initialize something on the heap?

Answer 1

Short answer: No.

The code you show is shorthand for int[] x = new [] { 10, 20, 30 }
which is shorthand for int[] x = new int[] { 10, 20, 30}
which is shorthand for int[] x = new int[3]; x[0] = 10; x[1] = 20; x[2] = 30;

(see MSDN)

There is no difference in implementation.

The only way of allocating an array on the stack is using unsafe code with the stackalloc keyword, as pointed out in the comments. Example from MSDN:

int* block = stackalloc int[100];