1 Presented by Bikash Shrestha

2 What is ASP.NET or ASP+? ASP.NET/ASP+ is a programming framework built on the common language runtime that can be used on a server to build powerful Web applications.

3.NET Architecture

4 What is ASP.Net?  Next generation of ASP  New paradigm for server side scripting  Part of new.net framework

5 Why ASP.NET?  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)

6 Why ASP.NET?  Flexible Language Options ASP support VBScript and Jscript ASP.NET supports 25.NET languages Includes built in support for VB.NET, C++, C#, and JScript.NET

7 Why ASP.NET?  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

8 Why ASP.NET?  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

9 Compatibility  Not fully compatible with ASP, however can run side by side with older versions.  Instead of.asp it uses.aspx extensions.

10 Syntax and Semantics  ASP.NET fully API-compatible with traditional ASP except Request() Request.QueryString() Request.Form()  ASP.NET returns string  ASP returns array of strings

11 For ASP.NET  Cnn.com/Test.aspx?value=45&valu e=600 would be accessed as follows:  <% ' Below line outputs: "45, 600" Response.Write(Request.QueryString("values"))  ' Below line outputs: "45" Response.Write(Request.QueryString.GetValues("value s")(0)) %>

12 Syntax & Semantics  ASP.NET pages support only a single language.  ASP.NET page functions must be declared in blocks unlike in ASP.

13 Syntax & Semantics  Page-render functions are not supported  Example IN ASP  <% Sub RenderSomething() %> Here is the time: <% RenderSomething RenderSomething %>

14 Syntax & Semantics  Example IN ASP.NET Sub RenderSomething() Response.Write(" ") Response.Write("Here is the time: " & Now) End Sub <% RenderSomething() RenderSomething() %>

15 Display Hello World in ASP.NET  Save the file as an.aspx extension Hello W3Schools! first aspx code to display "hello world"

16 Limitation of Classic ASP  Code has to be placed where the output apprears  Impossible to separate ASP code from HTML  Eg.  Hello W3Schools!

17 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

18 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.

19 Example of HTML Server Control  Sub Page_Load link1.HRef=" End Sub Visit W3Schools! anchor example

20 HTML Server Control contd… HTMLButton HTMLImage 2 HTMLInputbutton HTMLInputCheckbox HTMLInputHidden HTMLInputImage HTMLInputRadiobutton HTMLTable HTMLTextarea

21 ASP.NET - Web Server Controls  ASP.NET tags understood by the server  Like HTML Server Controls, require runat="server" to execute in server  Like HTML Server Controls, require id.  Does not map to HTML Elements.  More complex elements

22 ASP.NET - Web Server Controls contd… AdRotator Calendar CheckboxList DropdownList Hyperlink Image Label Listbox Literal Panel RadiobuttonList Table

23 ASP.NET - 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.

24 ASP.NET - Validation Server Controls contd…  CompareValidator CompareValidator  CustomValidator CustomValidator  RangeValidator RangeValidator  RegularExpressionValidator RegularExpressionValidator  RequiredFieldValidator RequiredFieldValidator  Validationsummary Validationsummary

25 ASP.NET - Events  An Event Handler is a subroutine that executes code for a given event.  Example of The page load eventThe page load event  Example of The Page.IsPostBack PropertyThe Page.IsPostBack Property

26 ASP.NET Web Forms  All server controls must appear within a 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!  Submitting a Form Example Self PostingSelf Posting

27 ASP.NET 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

28 Data Binding - ArrayList Object  The ArrayList object is a collection of items containing a single data value.  Example - ArrayList RadioButtonListArrayList RadioButtonList

29 Data Binding - The Hashtable Object  The Hashtable object contains items in key/value pairs.  Cannot sort items.  Example- Hashtable DropDownList Hashtable DropDownList  A Hashtable object may automatically generate the text and values to the following controls: asp:RadioButtonList asp:CheckBoxList asp:DropDownList asp:Listbox

30 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 BindingExample 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 example of Repeaterexample of Repeater  The DataList Same as Repeater, except it adds a table around the data items by default. DataList DataList DataList

31 ASP.NET 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? part of the.NET Framework consists of a set of classes to handle data access is entirely based on XML unlike ADO, has no Recordset object  Example of : Database connection - Repeater control Database connection - Repeater control

32 Helpful Hints  Most of my work are from    and  Beginning ASP.NET 1.0 with Visual Basic.NET published by wrox Programmer to Programmer ISBN  Also to download this slides you can check at

33 Thank you  Open for questions or concerns