CSCI 3328 Object Oriented CSCI 3328 Object Oriented Programming in C# Programming in C#

Chapter 2: Introduction to Visual C# Chapter 2: Introduction to Visual C# ProgrammingProgramming

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Xiang Lian

The University of Texas Rio Grande Valley

Edinburg, TX 78539

xiang.lian@utrgv.edu

Objectives

• In this chapter, you will– Become familiar with the IDE, Visual Studio – Learn more controls of Visual C# programming– Discover differences between different controls– See more examples of designing the graphical

interface– Become aware of the console application, in

addition to windows forms application

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Demo in the Classform

label

button

Text

BackColor

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Integrated Development Environment (IDE)

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Integrated Development Environment (cont'd)

• Menu bar

– File: Open/New/Save/Close projects or files– Edit: Undo/Redo, Copy, Paste, Cut– View: Other Windows Properties– Build– Debug: Start Debugging, Step Into, Step Over

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Integrated Development Environment (cont'd)

• Buttons– For files and edit

– For compilation

– For debugging

• If some buttons do not appear, right click your mouse on the tool bar and customize buttons

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Integrated Development Environment (cont'd)

• Windows

Properties Solution Explorer

events

show all files

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Visual C# Controls

• Choose Windows forms application• What you see is the IDE (Integrated Development

Environment)• Use Sizing handle to make the form• Adjust the size of the properties window• In the toolbox

– Use common controls

• Start placing objects on the form• Place a button, label it OK and add code this.Close()

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Controls

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TextBox

• Difference between label and text boxes• Properties window

– Changing name and text– Border Style– BackColor– Font Size– Visible– TabIndex

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PictureBox

• Properties– Image Local resource Import– SizeMode: Normal, Stretch Image, AutoSize,

CenterImage, Zoom

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GroupBox

• Properties– Text

• RadioButton– Checked = "false"– Add radio buttons to the group box– At most one radio button is checked at a time

• CheckBox– 0 or any number of boxes are checked

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Other Interesting Controls

• ProgressBar– Value: 50

• ListBox– Items: enter strings one per line

• ComboBox

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Adding a Pop-Up Message Box

Add a form to the application

Add this lineMessageBox.Show("Hello!");

MessageBox.Show("Hello!", "Show Message");

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Example of GUI Design

• Notepad GUI– Menu strip– Rich TextBox

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Example of GUI Design (cont'd)

• Calendar GUI– Label– MonthCalendar– RichTextBox

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Analyzing a Program

• Line numbers: not part of Visual C#

• Comments: (Lines 23-29)

• Classes: class declaration (Lines 12-31)• Keywords: Case sensitive (the same as C++)

• public, private, class

• partial

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event handling

Variable Declaration and Naming

• Variable declaration– Same as C++

• Data types: int, float, double, char, etc.

• Variable name: (1) digits, letters, underscore ("_"), and (2) cannot start with a digit

• int x = 1;

• int x = 0, y = 1;

• Naming convention– Camel case: e.g. firstNumber

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Assignment

• Use DOT (.) to refer to attributes of an object– E.g., Label1.Text

• Use assignment operator (=) to give a value to a variable– E.g., Label1.Text = "haha"

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Applications

• In addition to Windows Forms Application, …

• Console– Output appears in console window– From Visual Studio choose C# and choose a new

project, and choose Console Application– Give it a name

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Demo of Hello Program

string name;

name=Console.ReadLine();

Console.WriteLine("Hello! " + name);

Console.WriteLine("Welcome to Dr. Lian's C# Class!");

Console.ReadLine();

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Demo of Hello Program (cont'd)

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Summary

• IDE– Menu bar, buttons, windows, toolboxes

• Controls– TextBox, PictureBox, GroupBox, etc.

• GUI design– Examples

• Program analysis• Windows Forms Application vs. Console

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