Enum, TryParse, cast to enum, C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Microsoft (R) Visual C# Compiler version 2.9.0.63208 (958f2354)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public enum AppInfoResult
        {
            UPDATED = 0,
            UPDATE_OPTIONAL = 1,
            UPDATE_MANDATORY = 2,
            UNKNOWN = 3
        }

public static void Main(string[] args)
        {
            Console.WriteLine("Hello, world!");
            
            var enumAsEnum = AppInfoResult.UPDATE_MANDATORY;
            var enumAsInt = (int) enumAsEnum;
            Console.WriteLine($"Enum {enumAsEnum} as int: {enumAsInt}");
            
            var intForConvertingToEnum = 1;
            //var intForConvertingToEnum = 4; //No enum returned! Returns 4 !!!
            AppInfoResult intConvertedToEnum = (AppInfoResult)intForConvertingToEnum;
            Console.WriteLine($"int {intForConvertingToEnum} as enum: {intConvertedToEnum}");
            
            
            
            var appInfoResult1 = "UPDATED";
            if (!Enum.TryParse(appInfoResult1, true, out AppInfoResult result1))
                result1 = AppInfoResult.UNKNOWN;
            Console.WriteLine($"Parsed string: {appInfoResult1} --> {result1}");
            
            var appInfoResult2 = "KKKKKKK";
            if (!Enum.TryParse(appInfoResult2, true, out AppInfoResult result2))
                result2 = AppInfoResult.UNKNOWN;
            Console.WriteLine($"Parsed string: {appInfoResult2} --> {result2}");
            
            
            
            var longAsStr = "123";
            var longAsLong = long.Parse(longAsStr);
            Console.WriteLine($"long.Parse \"{longAsStr}\" --> {longAsLong}");

Show compiler warnings [ + ] Show input
Compilation time: 1.96 sec, absolute running time: 0.5 sec, cpu time: 0.35 sec, memory peak: 40 Mb, absolute service time: 2,53 sec