Question

I am writing a program in C#, and I want to catch exceptions caused by converting "" (null) to int. What is the exception’s name?

EDIT:
I’m not sure I can show the full code… But I’m sure you don’t need the full code, so:

int num1 = Int32.Parse(number1.Text);
int num2 = Int32.Parse(number2.Text);

Answer 1

If you can avoid it, do not code by exception!

The exception name you are looking for is called a FormatException.

However, it would be smarter to first do a TryParse on the object you are attempting to parse, e.g.

int value;
if(!int.TryParse("1", out value))
{
    // You caught it without throwing an exception.
}