int max = intArray[0];    // first element be the max
        int i = 0;
        for (i = 1; i < intArray.Length; i++)
        {
            if (intArray[i] > max)
            {
                max = intArray[i];
            }
 
        }

int[] arr = new int[] {12,44,55,33 }; 
            lblMax.Text = arr.Max().ToString(); 
            lblMin.Text = arr.Min().ToString(); 
            lblAvg.Text = arr.Average().ToString();