Computer Programming 2
windows form GUI
Dr. Ahmed Taha – T.A. Ghada Adel
CLI
GUI
CLI stands for Command Line Interface.
GUI stands for Graphical User Interface.
CLI
GUI
GUIs use visual elements such as windows, menus,
and icons to interact with the computer system.
CLIs require users to type commands into a
terminal or console to interact with the computer.
GUIs are typically more user-friendly.
CLIs are typically faster and more efficient than
GUIs, as they require fewer system resources.
GUIs require minimal knowledge of commands
and syntax.
GUIs may be slower and less efficient than CLIs,
as they require more system resources.
CLIs can perform complex operations with a
single command.
CLIs have a steeper learning curve and require
knowledge of command syntax.
C# METHODS
C# provides a wide range of built-in methods and libraries to
simplify common programming tasks.
A method is a block of code which only runs when it is called.
You can pass data, known as parameters, into a method.
Methods are used to perform certain actions, and they are also
known as functions.
WHY USE METHODS?
TO REUSE CODE:
DEFINE THE CODE ONCE,
AND USE IT MANY TIMES.
C# provides some pre-defined methods, which you
already are familiar with, such as Main()
HERE ARE SOME COMMONLY USED METHODS IN C#
Console.WriteLine: This method is used to display text on the console.
SIMPLE METHOD
Static means that the method belongs to the Program class and not an object of the Program class.
Void means that this method does not have a return value.
USING METHODS
METHOD PARAMETERS
CLASS
CLASS
Class
CLASS
members / variables
CLASS
method / function
CREATE OBJECT
FROM CLASS
SET VALUES TO
THE OBJECT
CREATE MULTIPLE OBJECTS
FROM THE SAME CLASS
Class
Method inside the class
to displa value on console
Method parameters
CONSTRUCTOR
A CONSTRUTOR is a special method that is automatically called when an object is
created from a class. Its primary purpose is to initialize the objects, typically by
setting its member variables to default or specific values.
A constructor is a special method that is used to initialize objects. The
advantage of a constructor, is that it is called when an object of a class is
created. It can be used to set initial values for fields:
Constructor
Access modifier
C# EVENTS
In C#, events are a way of notifying an object or method when something
significant has occurred, such as a button being clicked, a file being opened, or a
database record being updated.
Events allow one object to notify other objects that a particular action has
occurred, without the need for those objects to continuously poll for
updates.
Event handling function
for the button click event
EXAMPLE 1
Replace label text
by text entered by user
EXAMPLE 2
Show a new message box
showing name of user
PRACTICE TIME
STOPWATACH
GUI
CODE
CODE
THANK
YOU
Dr. Ahmed Taha – T.A. Ghada Adel