Format strings with percentages testing

FormatStringProgram.cs

using System;
using System.Globalization;
using System.Collections.Generic;
					
public class Program
{
	private static List<string> formatStrings = [
		"Doing {0}: {1}%",
		"Doing {0}: {1:#0%}",
		"Doing {0}: {1:#0}%",
		"Doing {0}: {1:P}%"
	];
	
	private static Dictionary<string, string> results = new();
	
	private static Random random = new Random(42);
	
	public static void Main()
	{
		foreach (var formatString in formatStrings)
		{
			decimal randomPercentage = (decimal)random.NextDouble();
			
			var result = FormatString(formatString, "Something", randomPercentage);
			
			results.TryAdd(formatString, result);
		}
		
		
		foreach (var result in results)
		{
			Console.WriteLine($"Format string '{result.Key}' yielded output:{Environment.NewLine}{result.Value}");
		}
	}
	
	private static string FormatString(string formatString, string title, decimal percentage)
	{
		try
		{
			return string.Format(CultureInfo.InvariantCulture, formatString, title, percentage);
		}
		catch (Exception ex)
		{
			return ex.Message;
		}
	}
}

Script output on dotnetfiddle.net

Format string 'Doing {0}: {1}%' yielded output:
Doing Something: 0.668106465911542%
Format string 'Doing {0}: {1:#0%}' yielded output:
Doing Something: 14%
Format string 'Doing {0}: {1:#0}%' yielded output:
Doing Something: 0%
Format string 'Doing {0}: {1:P}%' yielded output:
Doing Something: 52.28 %%