Prove the determinant of a 2x2 block matrix can be opened with the regular determinant formula

Question

Let $A, B, C, D \in M_n(F)$, such that $C$ and $D$ are invertible and $CD=DC$.

Prove:

\begin{vmatrix} A & B \\ C & D \end{vmatrix} = $|AD - BC|$

What is the direction? Thanks.