Performing Basic Searching

int[] arraySearch = { 1, 2, 3, 4, 5, 6, 7, 8 };
int target = 6;
var index = -1;

for (int i = 0; i < arraySearch.Length; i++)
{
    if (arraySearch[i] == target)
    {
        index = i;
    }
}

Console.WriteLine(index);