Question

I have the following code:

aVariable =  int.Parse(Console.ReadLine());

One problem I have is I cannot find any support material to help validate the user input, for instance if the user pressed the letter a, this would simply kill the program.

What can I do? Where can I find a decent tutorial?

Answer 1

int.Parse throws a FormatException, when the string cannot be parsed. You can catch this exception and handle it, e.g. show an error message.

Another way is to use TryParse:

int number = 0;
bool result = Int32.TryParse(value, out number);
if (result)
{
   Console.WriteLine("Converted '{0}' to {1}.", value, number);         
}