I need to do this again | C# Online Compiler

I need to do this again by Alleel

using System;
					
public class Program
{
	public static void Main()
	{
		Console.WriteLine("Please Enter a Number");
		int num = Convert.ToInt32(Console.ReadLine());
		for (int i= num; i>= 1; i--){
			Console.Write("Listing: " + i + "-" );
		}
		Console.Write("Listing: " + i + "-" );
	}
}

 
using System;
                    
public class Program
{
    public static void Main()
    {
        Console.WriteLine("Please Enter a Number");
        int num = Convert.ToInt32(Console.ReadLine());
        for (int i= num; i>= 1; i--){
            Console.Write("Listing: " + i + "-" );
        }
        Console.Write("Listing: " + i + "-" );
    }
}

Controller: Compilation error (line 7, col 38): The type or namespace name 'ApiController' could not be found (are you missing a using directive or an assembly reference?)
Controller: Compilation error (line 9, col 26): The type or namespace name 'CompanyRepository' could not be found (are you missing a using directive or an assembly reference?)
Controller: Compilation error (line 11, col 34): The type or namespace name 'CompanyRepository' could not be found (are you missing a using directive or an assembly reference?)
Controller: Compilation error (line 18, col 16): The type or namespace name 'IHttpActionResult' could not be found (are you missing a using directive or an assembly reference?)
Controller: Compilation error (line 16, col 10): The type or namespace name 'Route' could not be found (are you missing a using directive or an assembly reference?)
Controller: Compilation error (line 16, col 10): The type or namespace name 'RouteAttribute' could not be found (are you missing a using directive or an assembly reference?)
Controller: Compilation error (line 17, col 10): The type or namespace name 'HttpGet' could not be found (are you missing a using directive or an assembly reference?)
Controller: Compilation error (line 17, col 10): The type or namespace name 'HttpGetAttribute' could not be found (are you missing a using directive or an assembly reference?)
Controller: Compilation error (line 6, col 3): The type or namespace name 'RoutePrefix' could not be found (are you missing a using directive or an assembly reference?)
Controller: Compilation error (line 6, col 3): The type or namespace name 'RoutePrefixAttribute' could not be found (are you missing a using directive or an assembly reference?)

Last Run:	11:24:20 pm
Compile:	0s
Execute:	0.274s
Memory:	0b
CPU:	0s

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