How to Exit a Method without Exiting the Program?

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There are two ways to exit a method early (without quitting the program):

  • Use the return keyword.
  • Throw an exception.

Exceptions should only be used for exceptional circumstances – when the method cannot continue and it cannot return a reasonable value that would make sense to the caller. Usually though you should just return when you are done.

If your method returns void then you can write return without a value:

return;

Specifically about your code:

  • There is no need to write the same test three times. All those conditions are equivalent.

  • You should also use curly braces when you write an if statement so that it is clear which statements are inside the body of the if statement:

    if (textBox1.Text == String.Empty)
{
    textBox3.Text += "[-] Listbox is Empty!!!!\r\n";
}
return; // Are you sure you want the return to be here??

  • If you are using .NET 4 there is a useful method that depending on your requirements you might want to consider using here: String.IsNullOrWhitespace.

  • You might want to use Environment.Newline instead of "\r\n".
  • You might want to consider another way to display invalid input other than writing messages to a text box.

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