Dot net guide for beginner

.Net training In gandhinagar
12/17/14 http://shreedhoon.com/training/aspNetTraining.php
1
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C#/.NET
Basics 2
.net training in gandhinagar
Some code is from “C# in a
Nutshell” and “Programming C#”
http://shreedhoon.com/training/aspNetTraining.php 2
12/17/14

This week
• Event Handling and delegates
• ASP.NET Web Forms
• ASP.NET Web Services
12/17/14

Event Handling Model
• Delegates listen for the events and call
registered handlers
• Each component has a delegate for every
event it can raise
• We register a method with the delegate
and the delegate will call the method
asynchronously
12/17/14

Delegates (1)
• A Button, for example, needs to notify
some object when it is pushed
• We don’t want to hardwire (in the button)
which object to call
• A delegate is a reference type used to
encapsulate a method with particular
parameter types
12/17/14

Delegate (2)
using System;
delegate String Foo(String x); // create a delegate class
class Test {
public static void Main() {
Foo f = new Foo(ConvertToUpperCase); // create a delegate
object
String answer = f("abcd"); // call the method in the
// object
Console.WriteLine(answer);
}
public static String ConvertToUpperCase(String s) {
return s.ToUpper();
}
}12/17/14

Delegate (3)
public class Form1 : System.Windows.Forms.Form {
private System.Windows.Forms.Button multiplyButton;
public void foo() {
this.multiplyButton = new System.Windows.Forms.Button();
this.multiplyButton.Text = "Multiply";
this.multiplyButton.Click +=
new System.EventHandler(this.multiplyButton_Click);
}
private void multiplyButton_Click(object sender, System.EventArgs e)
{
textBox3.Clear();
string op1Str = op1.Text;
string op2Str = op2.Text;
:
}
Delegate reference
Delegate
Encapsulated
method
12/17/14

Multicast Delegate
using System; // From C# In A Nutshell
delegate void MethodInvoker(); // define delegate class
class Test {
static void Main() { // create a Test object
// and call its constructor
new Test();
}
12/17/14

Test() {
MethodInvoker m = null;
m += new MethodInvoker(Foo); // overloaded +=
m += new MethodInvoker(Goo); // delegate holds
m(); // pointers to two
} // methods
m
MethodInvoker
void Foo()
void Goo()
12/17/14

void Foo() {
Console.WriteLine("Foo");
}
void Goo() {
Console.WriteLine("Goo");
}
}
Output:
Foo
Goo
12/17/14

ASP.NET Web Forms (1)
• Web Forms bring rapid appplication
development to the web
• Similar technology is available on J2EE
platforms (struts, Java Server Faces)
• Drag and drop development for the web
tier – write event handlers as in Windows
Forms
• User interacts with the sever via a
standard browser
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• Web pages are dynamically generated
• Standard HTML is sent to the browser
• Notepad would work but Visual Studio
makes life easy
• The user interface code is in an .aspx file
• The logic (C# code) is stored in a separate
file (containing event handling code)
• Every .aspx file has this “code-behind” file
12/17/14

• Postback events are handled on the server with
an HTTP request. For example, the submit
button is clicked.
• Non-postback events are not handled by the
server immediately. For example, text is entered
into a form or the mouse is moved.
• State is automatically added to an otherwise
stateless protocol. .NET maintains the user’s
session.
12/17/14

Web Form Life Cycle
• Complicated series of activities similar to
what is found in J2EE struts and JSF
• For this class let’s just say that a lot of pre-and
post-processing goes on for each web
request
12/17/14

Creating A Web Form(1)
• Prerequisites: IIS and Front Page Server
Extensions (use Internet Service Manager
and right click on the web site/All
Tasks/Configure Server Extensions)
• Start/Microsoft Visual Studio .NET/ New
Project/Visual C#/ASP.NET Web
Application/BinomialTreeWebApp
• Generated code goes into
c:InetpubwwwrootBinomialTreeWebApp
12/17/14

Creating A Web Form(2)
• Two files generated
- The .aspx file holds the HTML
- The aspx.cs file holds the C#
• To see the C# code right click the form
and select view code
• Note that you can see the design view or
the HTML view (tabs on bottom)
12/17/14

Web Form Step-by-step(1)
(1) Start with a simple C# program – Divider.cs
using System;
public class Divider {
public int divide(int a, int b) {
return a / b;
}
public static void Main(String[] args) {
Divider s = new Divider();
Console.WriteLine(s.divide(10,5));
}
}
12/17/14

(2) Compile to a .dll
csc –t:library Divider.cs
(3) Run .NET
New Project
choose C#
select .NET Web Application
enter location: http://localhost/ADivider
12/17/14

(4) Paint the screen in design mode
(5) Right click to get to backing code
(6) Add a reference to the .dll with
Project/Add Reference
(7) Use the class
12/17/14

Web Services
“The internet is evolving from a collection
of isolated web sites and applications into
a general communication bus for
distributed applications.”
Pradeep Tapadiya, author of “.NET Programming”
12/17/14

ASP.NET Web Services(1)
0) Check if IIS is running by attempting to visit
http://localhost
1) If it's not running click Start/Settings/Control
Panel/Add Remove Programs/
Add Remove Windows Components and
enable IIS.
2) If .NET was installed after IIS reconfigure IIS by
running aspnet_regiis.exe /i from a command
prompt.
12/17/14

(1) Start with a simple C# program – Divider.cs
using System;
public class Divider {
public int divide(int a, int b) {
return a / b;
}
public static void Main(String[] args) {
Divider s = new Divider();
Console.WriteLine(s.divide(10,5));
}
}
12/17/14

(2) Compile to a .dll
csc –t:library Divider.cs
(3) Run .NET
New Project
choose C#
select ASP .NET Web Service
enter location: http://localhost/ADividerWS
12/17/14

(4) Add a reference to the .dll with
Project/Add Reference
(5) Edit the web service sample so that it
provides the correct signature and calls
the divide method
(6) Get the WSDL document from a
browser
(7) Run wsdl, compile the result, and write a
client
12/17/14

.net training in gandhinagar
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Dot net guide for beginner

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