File I/O: Think of a real world scenario associated with your work or hobbies in which a sequential data file would be useful.  Describe the scenario and write a code fragment or a complete program to implement the scenario.This description is for the C# language, please describe using at least 120 words and provide an original code fragment in C#. 

Design a class named CustomerRecord that holds a customer number, name, and address. Include methods to set the values for each data field and output the values for each data field. Create the class diagram and write the code (not language specific, ie. psuedocode) that defines the class. You can write as many constructors for a class as you want, as long as they all have different ____ lists. A. object B. data field C. method D. parameter Programmers refer to hidden implementation details as existing in a ____. A. white box B. white hole C. black box D. black hole A constructor may require ____. A. parameters B. methods C. objects D. inheritance A class diagram consists of a ____ divided into three sections. A. square B. rectangle C. circle D. triangle A method’s ____ consists of the method’s statements. A. body B. space C. space D. group Creating multiple methods with the same name, which will act differently and appropriately when used with different types of objects, is known as polymorphism.  True  False Overloaded methods have the same name and parameter lists.  True  False Everything is an object, and every object is a member of a ____. A. class B. method C. case D. process When illegal division by 0 takes place, an Exception object is not created automatically by the object-oriented language application.  True  False An instance method or constructor may be overloaded by providing the same name and ____ argument list. A. a different B. the same C. a larger D. a smaller When a variable is declared within a method, it ceases to exist when the method ends.  True  False What will be the output of the below program? List what will be outputed to the screen and explain your answer. class Class_name   main()       // Declarations     num index     num SIZE = 10     num numbers[SIZE] = 0,0,0,0,0,0,0,0,0,0   index = 0   while index < SIZE   numbers[index]= index * 10   index = index + 1   endwhile    output “The Output is: ”   while index > 0   index = index – 1   output numbers[index]   endwhile   return endClass A(n) ____ statement indicates the end of the catch block in the pseudocode. A. finalcatch B. finally C. endcatch D. stop ____ variables and constants are those that are known to an entire class. A. Global B. Local C. Universal D. Comprehensive Simple non-array variables are usually passed to methods by ____. A. value B. reference C. type D. class A(n) ____ is one instance of a class. A. method B. object C. instantiation D. attribute A method is a program module that contains a series of statements that carry out a task.  True  False The call stack is where the computer stores the list of exceptions.  True  False Class diagrams are a type of ____ diagram. A. Unified Illustration Language B. Unified Modeling Language C. Object-Oriented Modeling Language D. Unified Pseudocode Language A method can be used more than once within a program or in other programs.  True  False A catch block consists of four different elements: the keyword catch, followed by parentheses that contain an exception type and identifier, statements that take action to handle the error condition, an endcatch statement, and a return statement.  True  False What is the screen output of the following code segment? Explain the reasoning behind your answer. Test1 = 70 Test2 = 80 Test3 = 84 NumberOfTests = 3 Average = (Test1 + Test2 + Test3) / NumberOfTests IF Average >= 90 THEN   Output “Great job”   Output “Your average is: ”, Average ELSE IF Average >= 80 or Average <=89 THEN    Output “Nice work”   Output “Your average is: “, Average ELSE   Output : “Your Average is:”, Average   Output “, You will do better next time!” ENDIF Methods are sometimes called ____. A. segments B. modules C. classes D. routines When a data field is private, it is said to be ____ to any class other than the one in which it is defined. A. uninheritable B. implicit C. unreachable D. inaccessible A child class contains all the data fields and ____ of its parent. A. parameters B. classes C. methods D. procedures When a main() method needs to use another method, it calls, or invokes it.  True  False Multiple inheritance is the capability to inherit more than one method from a parent class.  True  False Libraries are collections of classes that serve related purposes.  True  False ____ is the process of creating a new, derived class from a base class. A. Accessibility B. Encapsulation C. Inheritance D. Polymorphism An object is a category of things.  True  False A ____ is one that sends an exception object out of a method so it can be handled elsewhere. A. catch statement B. throw method C. catch block D. throw statement A ____ reference is an automatically created variable that holds the address of an object and passes it to an instance method whenever the method is called. A. key B. public C. that D. this What is one item that must be included in a method’s header if it can receive a parameter? A. local parameter name B. global parameter name C. parameter’s client D. return data structure A ____ is a segment of code that can handle an exception that might be thrown by the try block that precedes it. A. catch method B. throw block C. catch block D. throw statement A parent class is the same thing as a base class.  True  False The object-oriented techniques to manage errors such as dividing a value by 0 comprise the group of methods known as ____. A. exception handling B. error handling C. exception processing D. error processing The memory location known as the ____ is where the computer stores the list of method locations to which the system must return. A. method stack B. location stack C. call stack D. store location When appropriate, specialized ____ classes provide an elegant way for you to handle error situations. A. Exception B. Error C. Constructor D. Event Methods can be ____ correctly by providing different parameter lists for methods with the same name. A. updated B. tested C. overloaded D. passed Write a method that will perform the a division operation (divide by) on the numbers passed to it in two variables (numerator, denominator) and outputs the results. Use a try-catch pair to output an error message if the illegal operation of divide by 0 occurs. The ability to use methods without knowing the details of their contents is a feature of ____. A. abstraction B. encapsulation C. inheritance D. construction Global variables are known to the entire class.  True  False Unreachable code statements are program statements that only execute if there is an exception.  True  False

For this project you will modify a small AJAX script to add some additional capabilities.  Ultimately, your project will consist of 5 files:proj7.html (the main project page)proj7.js (your JavaScript)message1.txtmessage2.txtmessage3.txtThe model you will use is the Ajax Demo Program. Using that program as a foundation, do the following:Modify the message files so that your name will display somewhere in the message. Modify proj7.html so that the script is removed to a separate file (proj7.js)Modify the html file so that 3 additional buttons are placed on a line below the current buttons.  These buttons will be labeled RED, BLUE, and BLACK.Modify the proj7.js script so that a single function is added to change the color of the text in the message.  The buttons themselves should pass the desired color to the function when calling it, i.e. the function should handle any color passed to it.The project should work like a sample that will be shown to you in class.  The change must be done using this method and NOT by refreshing the entire page.This is the code that will be adjusted:ajax.html<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><script type="text/javascript">function loadXMLDoc(url){if (window.XMLHttpRequest){// code for IE7+, Firefox, Chrome, Opera, Safarixmlhttp=new XMLHttpRequest();xmlhttp.open("GET",url,false);xmlhttp.send(null);}else{// code for IE6, IE5xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");xmlhttp.open("GET",url,false);// Do not send null for ActiveXxmlhttp.send();}document.getElementById('test').innerHTML=xmlhttp.responseText;}</script><title>MIS 4530 Ajax Sample</title></head><body><div id="test"><h2>Let AJAX change this text</h2></div><button type="button" onclick="loadXMLDoc('test1.txt')">Message 1</button><button type="button" onclick="loadXMLDoc('test2.txt')">Message 2</button><button type="button" onclick="loadXMLDoc('test3.txt')">Original</button> </body></html>test1.txt<p>There are several reasons you might want to use AJAX:</p><ul><li>Reduce the amount of data flowing from the server to the client</li><li>Speed up the web page</li><li>Make the application act more like a local app than a web page</li><li>Allow filtering at the client end to prevent corrupted data from being sent to the server</li></ul>test2.txt<p>Most good web developers have many things in their toolboxes, including JavaScript, php, mysql, xml, and html. These tools all lead to robust, interactive web pages and add to the capability of the developer to to design flexible, artistic, and useful web pages.</p>test3.txt<h2>Let AJAX change this text</h2>This will show what the above code will look like: http://www.eiu-mis.net/samples/ajax/ajax.htmlAll that really needs to be done is to add a RED, BLUE, and BLACK button horizontally under the message buttons and when those buttons are clicked it will change the color of the message shown regardless of which message is clicked.