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Our program defines a method called HandleLoadClick to handle this event. We link these two together by registering our method as an event handler for the Click event. HandleLoadClick); Since it is possible to have more than one handler for an event, the += notation is used to add a new event handler without removing any existing handlers. When multiple event handlers are registered, the handlers are typically called sequentially in the same order in which they were added. EventHandler is a delegate in C#, and specifies the signature required to process the event.

Exit Stops all running message loops and closes all windows in the application. Note that this may not force the application to exit. ExitThread Stops the message loop and closes all windows on the current thread only. Run Starts a standard message loop on the current thread. If a Form is given, also makes that form visible. ApplicationExit Occurs when the application is about to shut down. Idle Occurs when the application is about to enter the idle state. ThreadException Occurs when an uncaught exception occurs in a thread.

FileName Gets or sets the string containing the selected filename. FileNames Gets an array of strings containing the set of files selected. Filter Gets or sets the filename filter string, which determines the file type choices in the file dialog box. InitialDirectory Gets or sets the initial directory displayed by the file dialog box. RestoreDirectory Gets or sets whether the dialog box restores the current directory to its original value before closing. ShowHelp Gets or sets whether the Help button appears in the file dialog box.