numbers in incremental order lose first num in next line | C# Online Compiler

numbers in incremental order lose first num in next line by sahanasingri@gmail.com

using System;
					
public class Program
{
	public static void Main()
	{
		Console.WriteLine("enter the no of rows");
		int num = Convert.ToInt32(Console.ReadLine());
		
		for(int j=1;j<= num;j++)
		{
			for (int k = j; k <= num;k++)
            {
                Console.Write(k.ToString());               
            }
			Console.WriteLine('\n');			
		}
		
	}
}

 
using System;
                    
public class Program
{
    public static void Main()
    {
        Console.WriteLine("enter the no of rows");
        int num = Convert.ToInt32(Console.ReadLine());
        
        for(int j=1;j<= num;j++)
        {
            for (int k = j; k <= num;k++)
            {
                Console.Write(k.ToString());               
            }
            Console.WriteLine('\n');            
        }
        
    }
}

Run-time exception (line 8): Request for the permission of type 'System.Security.Permissions.UIPermission, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.

Stack Trace:

[System.Security.SecurityException: Request for the permission of type 'System.Security.Permissions.UIPermission, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.]
   at System.Security.CodeAccessSecurityEngine.Check(Object demand, StackCrawlMark& stackMark, Boolean isPermSet)
   at System.Security.CodeAccessPermission.Demand()
   at System.Console.set_BackgroundColor(ConsoleColor value)
   at HelloWorld.Main() :line 8

Last Run:	5:42:32 pm
Compile:	0.094s
Execute:	0s
Memory:	237.27kb
CPU:	0.016s

View IL Code