C# Try and Catch error message

Question

I recently started coding with c#, but I have encountered a problem that I have been trying to solve for a few hours now, so I thought I would give this a go. This is basically a simple program where the user can guess on a number between 1-20 and the computer will tell you if the number is too small or too big or if its the correct number.

Everything works fine except the try and catch part. I want the user to get an error message everytime they input a string instead of a number. I have tried different solutions but I can't work out what I have to put into the try block. As i said the program works fine when I don't use the try and catch, but when I use it the error message comes up every single time, so please help me and tell me what I have to write in the try part of the code.

this is the code:

using System;

namespace Uppgift_4
{
    class Program
    {
        static void Main(string[] args)
        {
            Random slumpat = new Random();
            int speltal = slumpat.Next(1,20); 

            bool spela = true; 
            while (spela)
            {
            Console.Write("\n\tGissa på ett tal mellan 1 och 20: ");
            int tal;
            Int32.TryParse(Console.ReadLine(), out tal);

            try
            {

            }
            catch
            {
                Console.WriteLine("Fel, du får bara skriva in nummer");
            }


            if (tal < speltal)
            {
                Console.WriteLine("\tDet inmatade talet " + tal + " är för litet, försök igen.");
            }

            else if (tal > speltal)
            {
                Console.WriteLine("\tDet inmatade talet " + tal + " är för stort, försök igen.");
            }

            else
            {
                Console.WriteLine("\tGrattis, du gissade rätt!");
                spela = false;
            }

        }
    }
}

}

Answer 1

When you use Int32.TryParse no exception will be thrown if given string cannot be parsed as integer number. This method will just return false. And you should check it:

Console.Write("\n\tGissa på ett tal mellan 1 och 20: ");
int tal;
if(!Int32.TryParse(Console.ReadLine(), out tal))
{
    Console.WriteLine("Fel, du får bara skriva in nummer");
    continue;
}

When you use Int32.Parse then exception will be thrown if string cannot be parsed:

Console.Write("\n\tGissa på ett tal mellan 1 och 20: ");
int tal;
try
{
   tal = Int32.Parse(Console.ReadLine());
}
catch
{
    Console.WriteLine("Fel, du får bara skriva in nummer");
    continue;
}