ASP' NET

1
ASP. NET
Lecture-6
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Agenda

• Exceptions
• Unstructured
• On Error
• Resume
• Structured
• Try Catch Finally
• Hyper Text Markup Language (HTML)
• Basic Structure
• ltHeadgt
• ltBodygt
• Basic Tags

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Unstructured Exception

• Syntax

Module Module1 Public sub ltsub_namegt ? On Error
Goto Handler ? Exit Sub Handler ? End Sub
End Module
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Unstructured Exception

• On Error
• The On Error GoTo statement enables exception
  handling and specifies the location of the
  exception-handling code within a procedure.
• Using On Error GoTo statement
• On Error GoTo line 0 -1 Resume Next
  

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Unstructured Exception

• Dim a, b, c As Integer
• a 0 b 15
• On Error GoTo Handler '''Important'''
• c b / a
• NextLine
• Response.Write("Program executed
  Successfully")
• Exit Sub
• Handler
• If TypeOf Err.GetException Is
  OverflowException Then
• Response.Write("Devide by Zero
  Error...")
• Resume NextLine
• End If
• End Sub

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Exceptions

• Object Exception
• ApplicationException
• CodeDomSerializerException
• InvalidPrinterException
• IOException
• IsolatedStorageException
• PathTooLongException
• CookieException
• ProtocolViolationException
• WebException
• MissingManifestResourceException
• SUDSGeneratorException
• SUDSParserException
• SystemException
• UriFormatException
• SoapException

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Exception example

• Object Exception
• SystemException
• ArithmeticException
• OverflowException
• ?

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Structured Exception

• Syntax

Public Sub ltsub_namegt Try ? Catch e As
Exception1 ? Catch e As Exception2 ? End Try
End Sub
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Structured Exception

• Dim a As Integer 0
• Dim b As Integer 15
• Dim c As Integer
• Try
• 'c b / a
• If b lt 18 Then
• Throw New ApplicationException("My
  Custom Exception ")
• End If
• Catch ex As ArithmeticException
• Response.Write("Arithmatic
  overflow...")
• Catch ex As ApplicationException
• Response.Write("Application exception
  caught")
• Catch ex As System.DivideByZeroException
• Response.Write("Devide by zero...")
• Finally
• Response.Write("Graceful
  degradation")
• End Try

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HTML ???

• The definition of HTML is HyperText Markup
  Language.
• HyperText is the method by which you move around
  on the web by clicking on special text called
  hyperlinks which bring you to the next page. The
  fact that it is hyper just means it is not linear
  i.e. you can go to any place on the Internet
  whenever you want by clicking on links there is
  no set order to do things in.
• Markup is what HTML tags do to the text inside
  them. They mark it as a certain type of text
  (italicised text, for example).
• HTML is a Language, as it has code-words and
  syntax like any other language.

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HTML How does it work ?

• HTML consists of a series of short codes typed
  into a text-file by the site author these are
  the tags.
• The text is then saved as a html file, and viewed
  through a browser, like Internet Explorer or
  Netscape Navigator.
• This browser reads the file and translates the
  text into a visible form.

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HTML Basic Structure

• lthtmlgt...lt/htmlgt
• Standard opening and closing tags for any HTML
  page. Enclose everything else in these. Container
  tag.
• lt!-- ... --gt
• A comment whatever you put here will be skipped
  over by the browser.
• ltheadgt...lt/headgt
• Starts the header part of your document.
  Everything between these is mainly used to help
  your browser and search engines classify your
  page. Using this is optional, but recommended.
  Container tag.
• ltbodygt...lt/bodygt
• Everything visible on your page goes between
  these tags. Everything. Container tag.

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My very first Page ?
lthtmlgt ltheadgt lttitlegtMy very first HTML
Pagelt/titlegt lt/headgt ltbodygt This is the
text ur page gonna show !!! lt/bodygt lt/htmlgt
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Head Tag ltheadgt

• lttitlegt...lt/titlegt
• Whatever is between these tags will appear in the
  blue bar at the top of the screen.
• ltmetagt
• A group of tags that give page and creator
  information specifically to the search engines.
• ltbasegt
• Changes the default link target or relative link
  URL, useful if the page is read on another
  server.
• ltlinkgt
• Allows you to associate stylesheets and a
  favorites icon to your page.

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Body Tag ltbodygt

• Background
• Bgcolor
• Text
• Link
• Vlink
• Alink

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Body Tag ltbodygt
ltHTMLgt ltHEADgt ltTITLEgtA study of population
dynamicslt/TITLEgt lt/HEADgt ltBODY
bgcolor"white" text"black" link"red"
alink"fuchsia" vlink"maroon"gt ...
document body ... lt/BODYgt lt/HTMLgt
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Basic Tags

• lthxgt...lt/hxgt
• Sets the text as a heading, with values of h1
  (the biggest) to h6 (the smallest).
• e.g.
• lth1gtThis is a headinglt/h1gt
• lth2gtThis is a headinglt/h2gt
• lth3gtThis is a headinglt/h3gt
• lth4gtThis is a headinglt/h4gt
• lth5gtThis is a headinglt/h5gt
• lth6gtThis is a headinglt/h6gt

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Basic Tags

• ltpgt
• The ltpgt tag defines a paragraph.
• Attributes
• Align left, right, center, justify

ltHTMLgt ltHEADgt ltTITLEgtA study of population
dynamicslt/TITLEgt lt/HEADgt ltBODY
bgcolor"white" text"black" link"red"
alink"fuchsia" vlink"maroon"gt ltp
ALIGNCENTER gt Paragraph number 1. lt/pgt lt/BODYgt
lt/HTMLgt
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Basic Tags

• Paragraph Container Tags
• ltFONTgt
• The ltfontgt tag specifies the font face, font
  size, and font color of text.
• Attributes
• Color rgb(x,x,x), xxxxxx, colorname
• Face Name of the font e.g. arial
• Size Number between 1 to 7

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Basic Tags
ltHTMLgt ltbodygt ltpgt ltfont size"2"
face"Verdana"gt This is a paragraph. lt/fontgt lt/pgt
ltpgt ltfont size"5" face"Times"gt This is another
paragraph. lt/fontgt lt/pgt lt/bodygt lt/HTMLgt
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Basic Tags

• ltIgtRenders as italic text
• ltBgtRenders as bold text
• ltUgtDefines Underlined text
• ltStrikegtDefines strikethrough text, same as ltsgt
• ltBIGgtRenders as bigger text
• ltSMALLgtRenders as smaller text
• ltSUBgtDefines Subscript text
• ltSUPgtDefines Superscript text

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Basic Tags

• ltEMgtRenders as emphasized text
• ltSTRONGgtRenders as strong emphasized text
• ltDEFgtRenders as strong emphasized text
• ltCODEgtDefines computer code text
• ltKBDgtDefines keyboard text
• ltBRgtThis tag inserts a single line break
• ltHRgt Tag inserts a horizontal rule.
• ltabbrgtIndicates an abbreviated form
• ltacronymgtIndicates start of an acronym

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Basic Tags

• ltAgt
• Defines anchor. It can be used in two ways
• To create a link to another document by using the
  href attribute.
• To create a bookmark inside a document, by using
  the name or id attribute.
• e.g.
• ltpgtltA hrefhttp//sdetu target_blankgt SDET
  Unit lt/Agtlt/pgt

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Questions???