A class diagram in the Unified Modeling Language (UML), is a type of static structure dagram that describes the structure of a system by showing the system's classes, their attributes, and the relationships between the classes.
OpenFileDialog: This class lets you do the following tasks:
Enable users to select one or more files on the local computer or on a networked computer.
Filter the file types shown in the dialog box.
Specify which filter is used when the dialog box is first displayed.
Sunday, March 29, 2009
Monday, March 23, 2009
24/03/09
Objects: Objects have properties and methods. Everything is an object.
Button: The button property is the things the buttojn has, the button method is the things the button does.
If we double click on button 1 - highlight button1 - right click, go to definition, then highlight button1 at the end, all the object methods and properties come up.
Button: The button property is the things the buttojn has, the button method is the things the button does.
If we double click on button 1 - highlight button1 - right click, go to definition, then highlight button1 at the end, all the object methods and properties come up.
Sunday, March 22, 2009
Classes and Objects
Concept of Class. A class is simply an abstract model used to define new data types. A class may contain any combination of encapsulated data (fields or member variables), operations that can be performed on the data (methods) and accessors to data (properties). For example, there is a class String in the System namespace of .Net Framework Class Library (FCL). This class contains an array of characters (data) and provide different operations (methods) that can be applied to its data like ToLowerCase(), Trim(), Substring(), etc. It also has some properties like Length (used to find the length of the string).A class in VB.Net is declared using the keyword Class and its members are enclosed with the End Class markerClass TestClass
' fields, operations and properties go here
End Class
Where TestClass is the name of the class or new data type that we are defining here.ObjectsAs mentioned above, a class is an abstract model. An object is the concrete realization or instance build on a model specified by the class. An object is created in memory using the 'New' keyword and is referenced by an identifier called a "reference".
' fields, operations and properties go here
End Class
Where TestClass is the name of the class or new data type that we are defining here.ObjectsAs mentioned above, a class is an abstract model. An object is the concrete realization or instance build on a model specified by the class. An object is created in memory using the 'New' keyword and is referenced by an identifier called a "reference".
23/03/09
Today we are learning about Case test expressions.
Select case: is a good structure to use instead of else, if you are using 3 or more options.
Case else: is another eventuality.
Using Ranges: Is another way to specify values in a select case.
Select case: is a good structure to use instead of else, if you are using 3 or more options.
Case else: is another eventuality.
Using Ranges: Is another way to specify values in a select case.
Tuesday, March 17, 2009
Monday, March 9, 2009
10/3/09 UNICODE
Unicode
From Wikipedia, the free encyclopedia
Jump to: navigation, search
This article contains special characters. Without proper rendering support, you may see question marks, boxes, or other symbols.
The Unicode Standard, Version 5.0
Unicode
Character encodings
Comparison
UTF-7, UTF-1
UTF-8, CESU-8
UTF-16/UCS-2
UTF-32/UCS-4
UTF-EBCDIC
SCSU, BOCU-1
Punycode (IDN)
GB 18030
UCS
Mapping
Bi-directional text
BOM
Han unification
Unicode and HTML
Unicode and E-mail
Unicode typefaces
Unicode is a computing industry standard allowing computers to consistently represent and manipulate text expressed in most of the world's writing systems. Developed in tandem with the Universal Character Set standard and published in book form as The Unicode Standard, Unicode consists of a repertoire of more than 100,000 characters, a set of code charts for visual reference, an encoding methodology and set of standard character encodings, an enumeration of character properties such as upper and lower case, a set of reference data computer files, and a number of related items, such as character properties, rules for normalization, decomposition, collation, rendering and bidirectional display order (for the correct display of text containing both right-to-left scripts, such as Arabic or Hebrew, and left-to-right scripts).[1]
The Unicode Consortium, the non-profit organization that coordinates Unicode's development, has the ambitious goal of eventually replacing existing character encoding schemes with Unicode and its standard Unicode Transformation Format (UTF) schemes, as many of the existing schemes are limited in size and scope and are incompatible with multilingual environments.
Unicode's success at unifying character sets has led to its widespread and predominant use in the internationalization and localization of computer software. The standard has been implemented in many recent technologies, including XML, the Java programming language, the Microsoft .NET Framework and modern operating systems.
Unicode can be implemented by different character encodings. The most commonly used encodings are UTF-8 (which uses 1 byte for all ASCII characters, which have the same code values as in the standard ASCII encoding, and up to 4 bytes for other characters), the now-obsolete UCS-2 (which uses 2 bytes for all characters, but does not include every character in the Unicode standard), and UTF-16 (which extends UCS-2, using 4 bytes to encode characters missing from UCS-2).
From Wikipedia, the free encyclopedia
Jump to: navigation, search
This article contains special characters. Without proper rendering support, you may see question marks, boxes, or other symbols.
The Unicode Standard, Version 5.0
Unicode
Character encodings
Comparison
UTF-7, UTF-1
UTF-8, CESU-8
UTF-16/UCS-2
UTF-32/UCS-4
UTF-EBCDIC
SCSU, BOCU-1
Punycode (IDN)
GB 18030
UCS
Mapping
Bi-directional text
BOM
Han unification
Unicode and HTML
Unicode and E-mail
Unicode typefaces
Unicode is a computing industry standard allowing computers to consistently represent and manipulate text expressed in most of the world's writing systems. Developed in tandem with the Universal Character Set standard and published in book form as The Unicode Standard, Unicode consists of a repertoire of more than 100,000 characters, a set of code charts for visual reference, an encoding methodology and set of standard character encodings, an enumeration of character properties such as upper and lower case, a set of reference data computer files, and a number of related items, such as character properties, rules for normalization, decomposition, collation, rendering and bidirectional display order (for the correct display of text containing both right-to-left scripts, such as Arabic or Hebrew, and left-to-right scripts).[1]
The Unicode Consortium, the non-profit organization that coordinates Unicode's development, has the ambitious goal of eventually replacing existing character encoding schemes with Unicode and its standard Unicode Transformation Format (UTF) schemes, as many of the existing schemes are limited in size and scope and are incompatible with multilingual environments.
Unicode's success at unifying character sets has led to its widespread and predominant use in the internationalization and localization of computer software. The standard has been implemented in many recent technologies, including XML, the Java programming language, the Microsoft .NET Framework and modern operating systems.
Unicode can be implemented by different character encodings. The most commonly used encodings are UTF-8 (which uses 1 byte for all ASCII characters, which have the same code values as in the standard ASCII encoding, and up to 4 bytes for other characters), the now-obsolete UCS-2 (which uses 2 bytes for all characters, but does not include every character in the Unicode standard), and UTF-16 (which extends UCS-2, using 4 bytes to encode characters missing from UCS-2).
10/3/09 ASCII
American Standard Code for Information Interchange (ASCII), pronounced /ˈæski/[1] is a coding standard that can be used for interchanging information, if the information is expressed mainly by the written form of English words. It is implemented as a character-encoding scheme based on the ordering of the English alphabet. ASCII codes represent text in computers, communications equipment, and other devices that work with text. Most modern character-encoding schemes—which support many more characters than did the original—have a historical basis in ASCII.
Historically, ASCII developed from telegraphic codes. Its first commercial use was as a seven-bit teleprinter code promoted by Bell data services. Work on ASCII formally began October 6, 1960, with the first meeting of the American Standards Association's (ASA) X3.2 subcommittee. The first edition of the standard was published in 1963,[2][3] a major revision in 1967,[4] and the most recent update in 1986.[5] Compared to earlier telegraph codes, the proposed Bell code and ASCII were both ordered for more convenient sorting (i.e., alphabetization) of lists, and added features for devices other than teleprinters.
ASCII includes definitions for 128 characters: 33 are non-printing, mostly-obsolete control characters that affect how text is processed;[6] 94 are printable characters, and the space is considered an invisible graphic.[7] The ASCII character-encoding scheme is the most-commonly-used character set on the Internet.[8]
Historically, ASCII developed from telegraphic codes. Its first commercial use was as a seven-bit teleprinter code promoted by Bell data services. Work on ASCII formally began October 6, 1960, with the first meeting of the American Standards Association's (ASA) X3.2 subcommittee. The first edition of the standard was published in 1963,[2][3] a major revision in 1967,[4] and the most recent update in 1986.[5] Compared to earlier telegraph codes, the proposed Bell code and ASCII were both ordered for more convenient sorting (i.e., alphabetization) of lists, and added features for devices other than teleprinters.
ASCII includes definitions for 128 characters: 33 are non-printing, mostly-obsolete control characters that affect how text is processed;[6] 94 are printable characters, and the space is considered an invisible graphic.[7] The ASCII character-encoding scheme is the most-commonly-used character set on the Internet.[8]
10/3/09
Today we learnt about If Statements. If Statements evaluates to see if it is True Or False.
>= (greater than and equal to) is known as a relational operator - See page 315 of text book for other examples.
>= (greater than and equal to) is known as a relational operator - See page 315 of text book for other examples.
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