ASP



Presented by Bikash Shrestha

Study Handout.

To look at the working examples you can go to

What is or ASP+?

ASP+ is a programming framework built on the common language runtime that can be used on a server to build powerful Web applications.

It is

Next generation of ASP

New paradigm for server side scripting

Part of new .net framework

Why ?

Easy Programming Model

Avoids spaghetti code

Great pages with far less code than ASP

Easy display data

Easy validating user input

Easy uploading files

Works in all browser ( including Netscape, Opera, AOL, and IE)

Flexible Language Options

ASP support VBScript and Jscript

supports 25 .NET languages

Includes built in support for , C++, C#, and

Rich Class Framework

.NET Framework offers over 4500 classes that encapsulates rich functionality like

XML, data access, file upload,

regular expressions, image generation,

performance monitoring and logging,

transactions, message queuing,

SMTP mail, and more

Improved performance & Scalability

3 to 5 times faster than ASP

Due to dynamic compilation

Rich Output Caching

Eliminates the need to query the database on every request

Improve performance of data-driven pages

Compatibility

Not fully compatible with ASP, however can run side by side with older versions.

Instead of .asp it uses .aspx extensions.

Syntax and Semantics

is fully API-compatible with traditional ASP except for the following

Request()

Request.QueryString()

Request.Form()

returns string for all the above commands where as

ASP returns array of strings

For example to access values of value in address Test.aspx?value=45&value=600

Classic ASP would use this syntax

would use this syntax

pages support only a single language.

page functions must be declared in blocks unlike in ASP.

Page-render functions are not supported in

Page-render in ASP

Here is the time:

Same IN

Sub RenderSomething()

Response.Write(" ")

Response.Write("Here is the time: " & Now)

End Sub

Display Hello World in

Save the file as an Hello.aspx extension

Hello W3Schools!

Limitation of Classic ASP

Code has to be placed where the output apprears

Impossible to separate ASP code from HTML

Eg.

Hello W3Schools!

ASP .NET - Server Controls

The "spaghetti-code" problem solved with server controls.

Server controls are tags that are understood by the server.

Three kinds of server controls:

HTML Server Controls - Traditional HTML tags

Web Server Controls - New ASP .NET tags

Validation Server Controls - For input validation

HTML Server Controls

HTML tags understood by server.

Comparable to JavaScript but run at server

Regular HTML elements are, by default, treated as text.

Add runat="server" to HTML elements to make it programmable and to be run at server.

must be within a tag

id attribute is added to identify the server control

They can be used at a run time.

Example of anchor HTML Server Controls

Example of HTML Server Control

Sub Page_Load

link1.HRef=""

End Sub

Visit W3Schools!

Some objects/controls of HTML Server Control

HTMLButton

HTMLImage 2

HTMLInputbutton

HTMLInputCheckbox

HTMLInputHidden

HTMLInputImage

HTMLInputRadiobutton

HTMLTable

HTMLTextarea

Web Server Controls

These are ASP .NET tags understood by the server

Like HTML Server Controls, they require runat="server" to execute in server.

Like HTML Server Controls, they require id.

Does not map to HTML Elements.

More complex elements than HTML Elements

Some Controls/Objects of Web Server Controls

AdRotator

Calendar

CheckboxList

DropdownList

Hyperlink

Image

Validation Server Controls

Used to validate user-input

If invalid data, display an error message to the user

By default, page validation performed when Button, ImageButton, or LinkButton control is clicked

Prevent validation by changing CausesValidation property to false.

Some Objects of Validation Server Controls

CompareValidator

CustomValidator

RangeValidator

RegularExpressionValidator

RequiredFieldValidator

Validationsummary

ASP .NET - Events

An Event Handler is a subroutine that executes code for a given event.

Two example of event handlers are

The page load event

Page.IsPostBack Property

ASP .NET Web Forms

All server controls must appear within a tag with runat="server" tag.

By default the page is submitted to itself.

If action is set then method=“post “ by default, as in Classic ASP.

An .aspx page can only contain ONE

control!

Data Binding

Data binding is used to fill lists with selectable items from an imported data source, like a database, an XML file, or a script.

Usually uses an imported source.

the data is separated from the HTML

any changes to the items are made in the separate data source.

The following controls support data binding

asp:RadioButtonList

asp:CheckBoxList

asp:DropDownList

asp:Listbox

Data Binding Objects

ArrayList Object

The ArrayList object is a collection of items containing a single data value.

The Hashtable Object

The Hashtable object contains items in key/value pairs.

Cannot sort items.

A Hashtable object may automatically generate the text and values to the following controls:

asp:RadioButtonList

asp:CheckBoxList

asp:DropDownList

asp:Listbox

Other Data Binding Controls

SortedList object

It combines the features of both the ArrayList object and the Hashtable object.

XML Files

We can bind a XML files to get data. Example of XML Data Binding

The Repeater

It is used to display a repeated list of items that are bound to the control.

May be bound to a database table, an XML file, or another list of items.

The DataList

Same as Repeater, except it adds a table around the data items by default. DataList DataList

Database connection

To work with databases we need ADO .NET, which is a part of the .NET Framework and it is used to handle data access.

What is ADO .NET?

It is a part of the .NET Framework

It consists of a set of classes to handle data access

It is entirely based on XML

Unlike ADO, it has no Recordset object

Helpful Hints

Most of my work are from





and

Beginning 1.0 with Visual

published by wrox Programmer to Programmer

ISBN 1-861007-33-7

Also to download the presentation slides and see working examples of , you can check at

True/False

1) support 25 .NET languages including Visual and C++.

2) You can have both (.aspx) and asp (.asp) pages running in the same application.

3) is fully API-compatible with traditional ASP without any exception.

4) In , SortedList object is same as Hashtable object except the former can sort the values.

5) By default, in , the page is submitted to itself.

MCQ

1) Why is better than classic ASP

a. has better control over validating user input.

b. Unlike classic ASP, can support multiple language in a single page

c. avoids spaghetti code

d. Both a and c

e. All of the above

2) Why is different from classic ASP?

a. pages support only a single language.

b. page function must be declared in blocks

c. Page-render functions are not supported.

d. All of the above

3) Which of the controls in support Data Binding?

a. Radio Button

b. Repeater

c. Textbox

d. All of the above

e. None of the above

4) in is

a. Part of the .NET framework

b. Entirely based on XML

c. Unlike ADO, has no Recordset Object

d. All of the above

5) In , which is a Web Server Control

a. AdRotator

b. RegularExpressionValidator

c. CustomValidator

d. HTMLInputHidden

Short Answers

1) What are the three Server Controls used in ?

2) Name any two Event handler used in .

3) In , what is a must to process a form in the server?

4) In , what is Data Binding?

5) Name any three Data Binding objects used in .

Questions with Solution

True/False

6) support 25 .NET languages including Visual and C++. True

7) You can have both (.aspx) and asp (.asp) pages running in the same application.True

8) is fully API-compatible with traditional ASP without any exception. False

9) In , SortedList object is same as Hashtable object except the former can sort the values. True

10) By default, in , the page is submitted to itself. True

MCQ

1) Why is better than classic ASP (d)

f. has better control over validating user input.

g. Unlike classic ASP, can support multiple language in a single page

h. avoids spaghetti code

i. Both a and c

j. All of the above

2) Why is different from classic ASP? (d)

e. pages support only a single language.

f. page function must be declared in blocks

g. Page-render functions are not supported.

h. All of the above

3) Which of the controls in support Data Binding? (b)

f. Radio Button

g. Repeater

h. Textbox

i. All of the above

j. None of the above

4) in is (d)

e. Part of the .NET framework

f. Entirely based on XML

g. Unlike ADO, has no Recordset Object

h. All of the above

5) In , which is a Web Server Control (a)

e. AdRotator

f. RegularExpressionValidator

g. CustomValidator

h. HTMLInputHidden

Short Answers

6) What are the three Server Controls used in ?

a. HTML Server Controls

b. Web Server Controls

c. Validation Server Controls

7) Name any two Event handler used in .

a. The page load event

b. The Page.IsPostBack Property

8) In , what is a must to process a form in the server?

a. The form must have a tag

9) In , what is Data Binding?

Data binding is used to fill lists with selectable items from an imported data source, like a database, an XML file, or a script.

10) Name any three Data Binding objects used in .

a. ArrayList Object

b. Hashtable Object

c. SortedList object

d. XML Files

e. The Repeater

f. The DataList

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