First Button Click Event: Using a Do Loop with a Sentinel value of $-1$ ask the user to type in the list of courses they have completed $($ex: CIS$115).$ As they enter the courses, display the courses in a listbox.Second Button Click Event: Once the course listbox has been populated, the user will select a course from the listbox that will be converted into a new string using the guidelines given below.This event must validate that a course has been selected from the listbox before the process of generating the new string coded name can be done. $($Hint: see page $274.)$If a course has been selected, that name should be read into the program and converted to 'code' as follows: All letters are converted to lower case. All vowels within the string should be removed. Replace numbers should be converted as follows: $1$ will become an exclamation point $(!)2$ will become the letter z $($lower case$)3$ will become the letter E $($upper case$)4$ & $8$ will become dollar signs $($$$)5$ will become the letter S $($upper case$)6$ & $7$ will become ampersands $($&$)0$ & $9$ will become letter o $($lower case$).$Once the 'coded course' name has been created, it is to be displayed in the output textbox.