How can I cast int[*,*] to int[][]

When I try, below given error occurred.  

cannot implicitly convert type "`int[*,*]` to `int[][]`"

My aim is first creating a Jagged array and then converting it to a 2d array. 

```
 private int[][] initStaticBoard()
    {

        int[,] board = new int[,] {
            {0,0,0,0,0},
            {0,0,0,0,0},
            {0,0,0,0,0},
            {0,0,0,0,0},
            {0,0,0,0,0}
        };
        int[][] result = board; 

        return result*emphasized text*;
    }

```