int [] numbers = { 5, 20, 1, 2, 9, 16, 22, 45, 23, 8, 33, 1, 2, 9,75 };
            int[] searchingNumbers = { 1, 2, 9 };

            for(int i = 0; i< numbers.Length; i++)
            {
                if(numbers.Skip(i).Take(searchingNumbers.Length).SequenceEqual(searchingNumbers) )
                {
                    try
                    {
                        MessageBox.Show(numbers[i + searchingNumbers.Length].ToString());
                    }catch
                    {
                    }
                   
                }
            }