Increasing Array with Rows

I have a feeling this is homework so I'm going to leave the actual coding to you. But here's how to do it in plain language:

1. Have a variable where we store the previous value. Let's call it oldValue, and start it with zero (if you're only using positive numbers in your array).
2. Go through the array one item at a time.
3. Check to see if that number is larger than oldValue.
4. If FALSE, print the new line character. "\n" in C#.
5. Print that number and make oldValue equal that number.
6. Unless your numbers are finished get the next number and go to step 3.

You never create a new line.

int[] arr = new[] {1, 2, 3, 2, 4, 8, 9, 7};

for(var i = 0; i < arr.Length; i++){
 if(i == 0 || ((i < arr.Length - 1) && arr[i] < arr[i + 1])){
  Console.Write(arr[i]);
 } else {
  Console.Write("{0}\n", arr[i]);
 } 
}

Output:

123
2489
7

Couple of remarks:

• Avoid the usage of this as a variable name. It's a reserved keyword.
• Use \n as a newline character.

There are a number of ways you can do this, either by appending a string with characters until a lesser one is reached and then using the Console.WriteLine() command to write the entire string at once, or (the easier way given your code) which is to simply test for the new value being lesser than the previous and inserting a newline character into your text.

// Start at zero
for (int i = 0; i < this.Length; i++) 
{
    // If this is not the first element in the array
    //   and the new element is smaller than the previous
    if (i > 0 && this[i] < this[i-1]) 
    {
        // Then insert a new line into the output
        Console.Write(Environment.NewLine);
    }
    Console.Write(this[i] + " ");
}

        int[] numbers = new int[] { 1, 2, 3, 2, 4, 8, 9, 7 };

        String orderedNumbers = String.Empty;

        for (int i = 0; i < numbers.Length; i++)
        {
            if (i == 0 || numbers[i] > numbers[i - 1])
            {
                orderedNumbers += numbers[i].ToString();
            }
            else
            {
                orderedNumbers += System.Environment.NewLine + numbers[i].ToString();
            }
        }

        MessageBox.Show(orderedNumbers);