Sams Teach Yourself C# in 24 Hours

By James Foxall and Wendy Haro-Chun

• Table of Contents
  • Copyright
  • About the Authors
  • Acknowledgments
  • Tell Us What You Think!
  • Introduction
  • Audience and Organization
  • Conventions Used in This Book
  • Onward and Upward!
  • Part I. The Visual Studio Environment
  • Hour 1. A C# Programming Tour
  • Hour 2. Navigating C#
  • Hour 3. Understanding Objects and Collections
  • Hour 4. Understanding Events
  • Part II. Building a User Interface
  • Hour 5. Building FormsPart I
  • Hour 6. Building FormsPart II
  • Hour 7. Working with the Traditional Controls
  • Hour 8. Advanced Controls
  • Hour 9. Adding Menus and Toolbars to Forms
  • Hour 10. Drawing and Printing
  • Part III. Making Things HappenProgramming!
  • Hour 11. Creating and Calling Methods
  • Hour 12. Using Constants, Data Types, Variables, and Arrays
  • Hour 13. Performing Arithmetic, String Manipulation, and Date/Time Adjustments
  • Hour 14. Making Decisions in C# Code
  • Hour 15. Looping for Efficiency
  • Hour 16. Debugging Your Code
    • Adding Comments to Your Code
    • Identifying the Two Basic Types of Errors
    • Using C#'s Debugging Tools
    • Writing an Error Handler Using try...catch...finally
    • Summary
    • Q&A
    • Workshop
  • Hour 17. Designing Objects Using Classes
  • Hour 18. Interacting with Users
  • Part IV. Working with Data
  • Hour 19. Performing File Operations
  • Hour 20. Controlling Other Applications Using Automation
  • Hour 21. Working with a Database
  • Part V. Deploying Solutions and Beyond
  • Hour 22. Deploying a Solution
  • Hour 23. Introduction to Web Development
  • Hour 24. The 10,000-Foot View
  • Appendix A. Answers to Quizzes/Exercises

Workshop

The Workshop is designed to help you anticipate possible questions, review what you've learned, and get you thinking about how to put your knowledge into practice. The answers to the quiz are in Appendix A, "Answers to Quizzes/Exercises."

1. Quiz

2. What type of error prevents C# from compiling and running code?
3. What is the name of a runtime error: an error that usually occurs as a result of attempting to process inappropriate data?
4. What character is used to denote a single line comment?
5. To halt execution at a specific statement in code, you set a what?
6. Explain the yellow arrow and red circles that can appear in the gray area in the code editor.
7. What IDE window would you use to poll the contents of a variable in Break mode?
8. True or False: You must always specify a catch section in a try structure.

Exercises

1. In the code example that sets lngAnswer to the result of a division expression, change lngAnswer from a long to a single (call it sngAnswer). Next, remove the if statement that tests the contents of the text box before performing the division. Do you get the same exceptions that you did when the variable was a long? Why or why not?
2. Rewrite the code that sets lngAnswer to the result of a division expression so that the code is wrapped in a try structure. Remove the if statements that perform data validation, and create two catch sections—one for each of the possible exceptions that may be thrown.

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