basics of asp.net. 2 © uw business school, university of washington 2004 outline installing asp.net...

Basics of ASP.NET

© UW Business School, University of Washington 2004

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Outline

• Installing ASP.NET and Web Matrix• Data Types• Branching Structure• Procedures and Functions• HTML Form• ASP.NET Server Controls• Page Events


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ASP.NET Installation

• Requirement for Operating Systems– Windows 2000/2003, or Windows XP Professional or Home

• Install the following– MDAC (Microsoft Data Access Components)

• Download MDAC 2.8 at www.microsoft.com/data (not SDK)• Filename: MDAC_TYP.EXE (5.4 MB)

– .NET Framework Redistributable version 1.1• Download at www.asp.net• Click Download link at the top right part of the window and

choose to download .NET• Filename: dotnetfx.exe (23.7 MB)

– Web Matrix • Download at www.asp.net • Filename: WebMatrix.msi (1.3 MB)


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ASP.NET Installation (Cont’d)Edit WebMatrix.exe.config file located at C:\Program files\Microsoft ASP.NET WebMatrix\v0.6.812\

<?xml version="1.0" encoding="utf-8" ?><configuration> <configSections> <sectionGroup name="microsoft.matrix"> <section name="packages"

type="Microsoft.Matrix.Core.Packages.PackageListSectionHandler, Microsoft.Matrix"/> … </sectionGroup> </configSections> <startup> <supportedRuntime version="v1.1.4322" /> </startup> <runtime> …

Insert this part


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First ASP.NET Program

• The @Page directive allows you to set the default properties for the entire page such as the default language

• Response object is used to send information to the browser

• Write is a method of the Response object, which allows you to send a string to the browser

http://infosys.badm.washington.edu/ebiz1/first.aspx


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Other Examples

• TextBox.aspxhttp://infosys.badm.washington.edu/ebiz1/textbox.aspx

• ListandRadio.aspxhttp://infosys.badm.washington.edu/ebiz1/listandradio.aspx


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Data Types

• Numeric• Text• Others

– Date

– Boolean


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String

• Strings are variable in length so you don’t have to specify the number of characters in the string when you create the string object

• Example:Dim Name As String

Name = “John”

• String ConcatenationName = “John” & “ Halata”


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Numeric Values

• Numeric Data Types

– Byte - stores an integer between 0 and 255

– Short - is a 16-bit number. Therefore, a short data type can only store values from -32,768 to 32,767

– Integer data type is a 32-bit whole number

– Long - is a 64-bit number

• Real number data types

– Single - represents a single-precision floating point number

– Double - supports larger numbers than the single data type

– Decimal - can store numbers up to 28 decimal places and is often used to store currency data


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DateTime

• DateTime data type is used to store any dates

and times between 01/01/0001 and 12/31/9999

as mm/dd/yyyy and hh:mm:ss

• The date value is enclosed within a pair of

pound signs

Dim MyBirthday As DateTime MyBirthday = #3/22/2002#dateTime = #1:30:00 PM#


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Boolean

• A Boolean data type only has two possible values, True value or False value

• Logical (Boolean) Operators– and, or, not

– Example

If number1 = 1 and number 2 = 2 Then

…

If not Page.IsPostBack Then

…


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Branching Structure

• If…Then…End If• If…Then…Else…End If• Example:

If email = “Yes” Then

Message.Text = “We will send you an email.”

Else

Message.Text = “We will mail you a receipt.”

End If


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Procedures

• Subroutines or sub-procedures do not return values and cannot be used in an expression value

• Create a Subroutine – Declared using the keyword sub

– Exit sub statement to exit the subroutine

– End with the keywords end sub

• Call keyword can be used to call a function or subroutine and is optional


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Event Procedure

• You can intercept the event using an event handler– Events such as click are intercepted by event handlers

such as onServerClick

– An event handler is also known as an event procedure

– An event procedure is not executed until an event triggers the event procedure

– An event procedure does not return a value

• The Page_Load event procedure is triggered when the page is loaded into the browser


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Functions

• A function is a block of code that is grouped into a named unit. – Built-in functions inherit from a .NET Framework

class

– User defined functions are declaredFunction GetStoreName() As Integer

'This function returns an integer

Return 23422

End Function


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Passing an Argument to a Function

• A pair of parentheses with zero or more arguments, also known as parameters, which are passed to the function when it is called– If no arguments are passed, you use an empty pair of

parentheses– If multiple arguments are used, you use a comma to

separate each argument


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Function Example

Function Add(ByVal i As Integer, ByVal j As Integer) As integer

Return i+j

End Function

Dim sum As integer

sum = Add(2, 3)


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HTML Forms

• <Form> tags are used to ask user information.• Form has two default button types:

– Submit: to submit information to the server.

– Reset: to clear information

• Example<form id=“MyForm” runat=“server”>

…

<input type=“reset”>

<input type=“submit”>

</form>


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ASP.NET Server Controls

• Two required attributes:– Runat=“server”

– ID=“…”

• ASP.NET code is never sent to the browser• All ASP.NET server controls will be converted

into HTML format before they are sent to the browser


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<asp:label>

• Purpose: displaying text• Attributes

– Text

– BackColor

– ForeColor

– …


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<asp:textbox>

• Purpose: user input• Attributes:

– textmode: one line (default), multiline, or passwrod

– rows: number of rows if textmode is set to multiline

– columns: number of columns if textmode is set to multiline


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<asp:radiobuttonlist>

• Choice of one option excludes selecting other options

• Example

<asp:radiobuttonlist id="fair" runat="server">

<asp:listitem id="op1" runat="server" value="First class" />

<asp:listitem id="op2" runat="server" value="Coach" />

</asp:radiobuttonlist><br />

fairclass = fair.SelectedItem.value


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<asp:dropdownlist>

• Selection from a list• Example

<asp:dropdownlist id="list1" runat="server">

<asp:listitem>Madrid</asp:listitem>

<asp:listitem>Oslo</asp:listitem>

<asp:listitem>Lisbon</asp:listitem>

</asp:dropdownlist>


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Page Events

• The Page object consists of a variety of methods, functions, and properties that can be accessed within the code behind the page

• The first time a page is requested by a client, a series of page events occurs

• The first page event is the Page_Init event which initializes the page control hierarchy

• The Page_Load event loads any server controls into memory and occurs every time the page is executed


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Postback

• The process of posting data back to a form is known as postback

• All server controls support postback by default

• The values that are stored with the page remain with the page


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Compiling the Page Class


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Recap

• Basics of the VB syntax• HTML form and ASP.NET server controls

basics of asp.net. 2 © uw business school, university of washington 2004 outline installing asp.net...

Documents

university of washington

uw business school

currency data slide

mb slide

boolean data type

basics of aspnet slide

integer data type

datetime datetime data