C# how to fill 2d array with array in random indexes

I'm having issues while creating an methods which accepts two parameters, one is char[,] array and second is char[] values; I need to fill 2d array in random indexes with all values from second array.

2d array is 6x6
and array with chars is max 36 chars long

public void FillArrayInRandomIndexes(char[,] array, char[] values)
{
   
}