C# Module 2 (Multiple of 3) Explain please, how the program works

Question

" You are an elementary school teacher and explaining multiplication to students.
You are going to use multiplication by 3 as your example.
The program you are given takes N number as input. Write a program to output all numbers from 1 to N, replacing all numbers that are multiples of 3 by "*".
Sample Input
7
Sample Output
12*45*7 "

Should I use the array here?

My code is terrible...

using System;
using System.Collections.Generic;

namespace SoloLearn
{
class Program
{
static void Main(string[] args)
{
int number = Convert.ToInt32(Console.ReadLine());
int i, arr[20];
for (i=0;i<number;i++)
{ if (number%3==0)
{arr[i]="*";}
Console.WriteLine(arr[i]);
}

}
}
}

Answer 1

You have an array declared incorrectly and array must be of the same data type)
In addition, the array is completely optional here, see this code
https://code.sololearn.com/cA340A0A1A20/?ref=app

Answer 2

Thank you very much guys. I got everything, I just confused with this task 👍💞