open the sunshine solution file. change the text box's maxLength property to 1. Change its character casing to property to Upper. Open the code editor window. the text box should accept only the backspace key and the letters A, a, B, and b. If the user clicks the display button without entering a code, the selection structure should display "not available" in the lblName control. It also should display a message box that contains the "Please enter a code" message, the text "department Codes" in the title bar, an ok button and an information icon. Make the appropriate modifications to the code. create an test data chart using the guidelines from figure 11-1 and the application's interface and code. save the solution and then start test the application. close the code editor window and then close the solution.