Array Of Random Alternate Positive And Negative Number in C#

I would like to generate array of 10 elements with random number between (-10,10).

And scenario is array can contain positive number between (0,10) for odd positions and contain negative number between(-10,0) for even position

For Example: 1,-2,3,-4,7,-1,3,-3,2,-9

And im totally stucked in generating -ve number at even places because im new in programming.

Any Help Is Appreciated,Thanx In Advance