C#

static void Main()
        {
            //Application.EnableVisualStyles();
            //Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new ListView1());
        }

using System;
using System.Collections.Generic;
using System.Windows.Forms;
using System.IO;
using ListView;

namespace WindowsApplication19
{
    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            //Application.EnableVisualStyles();
            //Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new ListView1());
        }
    }
}

String ss = listBox1.SelectedItem.ToString();

String ss;
if(listBox1.SelectedIndex >= 0)
    ss = listBox1.SelectedItem.ToString();
else
    ss = listBox1.Items[0].ToString(); //this will select the first item in the listbox

FileStream fs = new FileStream("FilePath", FileMode.Open);
Image.FromStream(fs);
fs.Close();

Image img = Image.FromStream(fs);

Eddy Vluggen wrote:

I prefer to return "null"

Rob Philpott wrote:

Exceptions in constructors is fine then