21. What is the method called that runs when a user acts upon a control or object on a Form Choose One 3 points OccurrenceHandler O ImportController O ActivityEvent O EventHandler 22, which of the following is used by C# to read data from a file? Choose One 3 points ? StreamWriter O FileWriter O StreamReader ? FileReader 23. Which property determines whether a minimize button is enabled on the Form? Choose One 4 points O Minimize O MinimizeButton O MinimizeBox O You can't disable the Minimize button 24. What two argument types are commonly taken in by an EventHandler? Choose One 4 points O Object and EventArgs O Sender and EventArgs O Sender and e O Object and e 25. You can show or hide controls on a Form using which of the following properties? Choose One 3 points O ShowHide ? Visible O Visibility O Cloaked