C#

if (string.IsNullOrWhitespace(textBox5.Text)) return;
if (!File.Exists(textBox5.Text)) return;

Quote:

Unlike Java, source files can contain more than one top-level public class declaration, and the file name does not need to match any of the classes' names.

CRobert456 wrote:

I have not tried to play with this yet but my feeling is that the file name
could be just arbitrary. Is it correct?

Bastard Programmer from Hell
If you can't read my code, try converting it here[^]

Tuple, Tuple<T>, Tuple<T1, T2>

private Func<bool> AllEmpty;
private Func<bool> AllFull; 
private Func<bool> AnyEmpty;

private Func<bool> CurrentTextBoxTest;

private void Form1_Load(object sender, EventArgs e)
{
    AllEmpty = new Func<bool>(() =>
    {
        return textBox1.Text == string.Empty && textBox2.Text == string.Empty && textBox3.Text == string.Empty;
    });

<pre>
AnyEmpty = new Func<bool>(() =>
{
    return (textBox1.Text == string.Empty || textBox2.Text == string.Empty || textBox3.Text == string.Empty);
});

private void TB_Leave(object sender, EventArgs e)
{
    if(CurrentTextBoxTest != null) button3.Enabled = CurrentTextBoxTest();
}

public static void RegisterRoutes(RouteCollection routes)
        {
            routes.RouteExistingFiles = false;
            routes.Ignore("SERVICE/{*pathInfo}");
            var settings = new FriendlyUrlSettings();
            settings.AutoRedirectMode = RedirectMode.Permanent;
            routes.EnableFriendlyUrls(settings);
        }