How to check if all the elements in an array are positive integers?

I have an array, say

int[] array = new int[] { 1, 5, 11, 5 };

How can I check (in the most easy and efficient way) that all elements are positive? If at least one number is not a positive integer, the system will respond in a negative way.

Desired output:

if all the numbers are positive, then it will display "All Positive" else "Wrong"

My shot

int[] array = new int[] { 1, 5, 11, 5 };
var x = array.All(c => c >= '0' && c <= '9');
if (x == true) "Positive" else "Wrong";