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I have array with int values
int[] myArr = (int[]) alItems.ToArray(typeof (int));
index = Array.BinarySearch(myArr, searchNumber);
When I have searchNumber in myArr it give me negative index, why?
If binary search returns -1, then the value is not within the array. This can also occur if the array is not sorted (which it needs to be for binary search to work).
Before using binary search you should understand how it works. Take some time to do just a little bit of research before you put it in your code.