70-536 Chapter: 1 Developing applications that use system types and collections

On October 25, 2009, in .NET, MCPD, MCTS, by Allen Ryan

Chapter: 1 Developing applications that use system types and collections
Type casting Type casting is the process of converting the value of a specific data type into another data type. There are two types of casting in .NET, i.e., implicit and explicit.
Array An array of data is declared by using a value data type with square braces and a variable name in which the array of data is to be stored.
params The params keyword provides the facility to specify a method parameter that takes a variable number of arguments.
Boxing Boxing is an implicit conversion of a value type to a reference type. Unboxing is the inverse of boxing.
static Variables that have only one copy per class are known as static variables. They are not attached to a particular instance of a class but rather belong to a class as a whole.
Value type A value type is a variable that contains data values, which are stored in a memory storage area known as the stack.
+ operator The + operator concatenates two strings, and as a result, produces a new String object. It may also be used to concatenate a string with other data types.
ToString(), GetType(), and Equals() The ToString(), GetType(), and Equals() methods are available in all the classes of .NET Framework.
Short datatype The Short datatype is stored as a signed 16-bit (2-byte) integer ranging in value from -32,768 to 32,767. It is also stored as an unsigned 16-bit (2-byte) integer ranging value from 0 to 65,535.
Enumeration Enumeration is used to provide symbols to a fixed set of related data values. Therefore, developers can use red, green, or blue, etc. instead of values such as 1, 2, or 3, etc.
Finally A finally block is used to execute a certain portion of code that must be executed, irrespective of whether or not an exception is caught.
unsafe The unsafe keyword is used in case of pointers in C#. The unsafe keyword denotes an unsafe code or block, which is required for any operation involving pointers.
Property Each class is made up of properties, methods, and events. Property is a named attribute of an object. Properties define the characteristics of an object, such as name.
Constructor A constructor is used to create an object that is an instance of a class. It has the same name as the class in which it resides.
Destructor A destructor is a special type of method used to destroy instances of a class when they are no longer used by an application. A destructor has the same name as the class in which it resides, preceded by a tilde (~) symbol.
Runtime environment The .NET Framework provides the development and runtime environment for .NET applications. It is composed of several components that are required to build and run .NET-based applications.
Logical errors Logical errors are those errors that appear in an application once it is in use. An application with logical errors compiles and executes correctly. However, it does not produce the desired result.
Array in C# When declaring an array in Visual C# .NET, only the upper bound of the array is defined. Arrays in Visual C# .NET are always zero-based, i.e., the lower bound is always zero.
Exception The common language runtime throws an exception when an error occurs during program execution resulting from a failed runtime check. This error is usually nonfatal and is recoverable by user programs.
Class A class is a reference type, and its object is created on the heap. On the other hand, a structure is a value type, and its object is created on the stack.
Pre and Postfix Use Pre and Post fix operators such as –, ++, etc to change the values of variables.
Method A user defined class that inherits abstract class and method.
Abstract An abstract method only has a semicolon after the method name and parenthetical argument list. The subclasses provide the body of the abstract method.
Inheritance Use inheritance feature of .NET in an application and define an abstract class that contains a declaration of an abstract method.
Button click event Use the button click event to change the back color of the form according to the choice of a user without exception handling.
StartPosition The StartPosition property of the form is used to display it at the center of the screen.
Random class The Random class is used to change the back color of the form in random order whenever you click the button.
Dock property The Dock property is used to cover the complete form.
ContextMenu Add a ContextMenu control in an application and use the Show() method of the ContextMenu to display in the application.
Try A try block must be followed by a catch block or a finally block.
Default constructors and explicit constructors Create and use default constructors and explicit constructors in an application.
ICollection interface The ICollection interface is implemented by all collections to provide the CopyTo() method as well as the Count, IsSynchronized, and SyncRoot properties. It is used to define size, enumerators, and synchronization methods for all non-generic collections.
SortedList and BitArray collections The SortedList and BitArray collections are accessed by an index.
IComparer and IComparable interfaces The IComparer and IComparable interfaces are used to sort a collection using the Array.Sort method.
System.Collections and System.Collections.Generic namespaces The following collections are available in both the System.Collections namespace and System.Collections.Generic namespace: Comparer SortedList Stack
DictionaryEntry object The DictionaryEntry object is used to store entries in a Hashtable collection.
IEnumerable and IDictionaryEnumerator interfaces The IEnumerable and IDictionaryEnumerator interfaces are used to create a new collection type that must be iterated using a for each loop.
IClassFactory interface The IClassFactory interface deals with two issues: locality and language independence. It provides a language-neutral way to create a COM object by a client.
AddRange The AddRange method of the Control.ControlCollection class is used to add an array of controls to a collection. It is also used to add a single control to a collection.
ArrayList The ArrayList class of the System.Collections namespace implements the IList interface by using an array of data.
SortedList object It adds names to a SortedList object and retrieves the index number of a name.
Hashtable object It retrieves values to their corresponding keys stored in a Hashtable object.
Dequeue The Dequeue method of the Queue class is used to retrieve as well as remove an item at the beginning of a queue.
IsValid The IsValid property of the CustomValidator control is used to indicate whether or not an input control passes validation.
LinkedList class The LinkedList class is a doubly linked list. It is created dynamically as per the requirements. It comprises a sequence of nodes; each node in the LinkedList Generic class contains a data field and one or two references pointing to the next and/or the previous node.
LinkedList.Enumerator The LinkedList.Enumerator is used to read all the data of a generic LinkedList. The LinkedList Generic class is a doubly linked list. It is created dynamically as per the requirements. It comprises a sequence of nodes, each node in the LinkedList Generic class contains a data field and one or two references pointing to the next and/or the previous node.
Ngen.exe If an application calls a large number of methods or large shared libraries at startup, using pre-compilation is the best technique to optimize the performance of the application during startup. Pre-compiling the application with Native Image Generator (Ngen.exe) reduces its startup time.
CompareTo The CompareTo method of the IComparable generic interface returns a 32-bit signed integer value that indicates the relative order of the objects that is to be compared.
StringDictionary The StringDictionary class is used to store key and value pairs. When you create an instance of the specialized StringDictionary class, you can use only string indexes and set only values that are strings.
BitVector32 structure The BitVector32 structure is used to provide a simple structure that stores boolean values and small integers in a 32-bit of memory size.
“= =” and Equals() If two strings are equivalent, the “==” returns true, also the “Equals()” method returns true. When you use “==” operator with the string class it compares value rather than the identity.
Hybrid Dictionary It manages collections and selects a class that is optimized for key-based item retrieval from both small and large collections using Hybrid Dictionary.
String concatenation It is used to gather data from multiple email messages and format the data for display on the page and ensure that the page displays the data as quickly as possible.
Interface An interface describes a group of related behaviors that can belong to a class or a struct.
Array.Sort and IComparer Create a new collection type that must be sorted by using the Array.Sort and IComparer interface.
IConvertable interface It converts the value of an object of an implementing type into a Common Language Runtime (CLR) type that has an equivalent value by using IConvertable interface.
EventArgs class Create a class that inherits from the EventArgs class to pass specialized information to an event handler apart from the source and event handler objects.
Multiple events can share the same delegate Multiple events can share the same delegate type. Once a delegate type is declared for an event, the event is declared as a delegate type field.
StackTrace The StackTrace property is used to trace a stack at runtime. It is an ordered collection of one or more stack frames.
Event A custom event can invoke a delegate.
PrintPageEventArgs The PrintPageEventArgs class is used to provide data for the PrintPage event and it occurs when the output for the current page is needed.
EditCommand event The EditCommand event of the DataGrid control occurs when users click the Edit button for a DataGrid item. The EditItemIndex property of the DataGrid control specifies the index of an item in the DataGrid control to edit.
TextBox event The TextBox event handler is used to execute when the TextChanged event of the TextBox is raised. The TextChanged event of the TextBox control occurs when the Text property value is changed.
TextChanged event When the TextChanged event of a TextBox control is fired, the text typed in one TextBox control will also appear in another TextBox control.

Chapter: 1

Developing applications that use system types and collections

Type casting

Type casting is the process of converting the value of a specific data type into another data type. There are two types of casting in .NET, i.e., implicit and explicit.

Array

An array of data is declared by using a value data type with square braces and a variable name in which the array of data is to be stored.

params

The params keyword provides the facility to specify a method parameter that takes a variable number of arguments.

Boxing

Boxing is an implicit conversion of a value type to a reference type. Unboxing is the inverse of boxing.

static

Variables that have only one copy per class are known as static variables. They are not attached to a particular instance of a class but rather belong to a class as a whole.

Value type

A value type is a variable that contains data values, which are stored in a memory storage area known as the stack.

+ operator

The + operator concatenates two strings, and as a result, produces a new String object. It may also be used to concatenate a string with other data types.

ToString(), GetType(), and Equals()

The ToString(), GetType(), and Equals() methods are available in all the classes of .NET Framework.

Short datatype

The Short datatype is stored as a signed 16-bit (2-byte) integer ranging in value from -32,768 to 32,767. It is also stored as an unsigned 16-bit (2-byte) integer ranging value from 0 to 65,535.

Enumeration

Enumeration is used to provide symbols to a fixed set of related data values. Therefore, developers can use red, green, or blue, etc. instead of values such as 1, 2, or 3, etc.

Finally

A finally block is used to execute a certain portion of code that must be executed, irrespective of whether or not an exception is caught.

unsafe

The unsafe keyword is used in case of pointers in C#. The unsafe keyword denotes an unsafe code or block, which is required for any operation involving pointers.

Property

Each class is made up of properties, methods, and events. Property is a named attribute of an object. Properties define the characteristics of an object, such as name.

Constructor

A constructor is used to create an object that is an instance of a class. It has the same name as the class in which it resides.

Destructor

A destructor is a special type of method used to destroy instances of a class when they are no longer used by an application. A destructor has the same name as the class in which it resides, preceded by a tilde (~) symbol.

Runtime environment

The .NET Framework provides the development and runtime environment for .NET applications. It is composed of several components that are required to build and run .NET-based applications.

Logical errors

Logical errors are those errors that appear in an application once it is in use. An application with logical errors compiles and executes correctly. However, it does not produce the desired result.

Array in C#

When declaring an array in Visual C# .NET, only the upper bound of the array is defined. Arrays in Visual C# .NET are always zero-based, i.e., the lower bound is always zero.

Exception

The common language runtime throws an exception when an error occurs during program execution resulting from a failed runtime check. This error is usually nonfatal and is recoverable by user programs.

Class

A class is a reference type, and its object is created on the heap. On the other hand, a structure is a value type, and its object is created on the stack.

Pre and Postfix

Use Pre and Post fix operators such as –, ++, etc to change the values of variables.

Method

A user defined class that inherits abstract class and method.

Abstract

An abstract method only has a semicolon after the method name and parenthetical argument list. The subclasses provide the body of the abstract method.

Inheritance

Use inheritance feature of .NET in an application and define an abstract class that contains a declaration of an abstract method.

Button click event

Use the button click event to change the back color of the form according to the choice of a user without exception handling.

StartPosition

The StartPosition property of the form is used to display it at the center of the screen.

Random class

The Random class is used to change the back color of the form in random order whenever you click the button.

Dock property

The Dock property is used to cover the complete form.

ContextMenu

Add a ContextMenu control in an application and use the Show() method of the ContextMenu to display in the application.

Try

A try block must be followed by a catch block or a finally block.

Default constructors and explicit constructors
Create and use default constructors and explicit constructors in an application.

ICollection interface
The ICollection interface is implemented by all collections to provide the CopyTo() method as well as the Count, IsSynchronized, and SyncRoot properties. It is used to define size, enumerators, and synchronization methods for all non-generic collections.

SortedList and BitArray collections

The SortedList and BitArray collections are accessed by an index.

IComparer and IComparable interfaces

The IComparer and IComparable interfaces are used to sort a collection using the Array.Sort method.

System.Collections and System.Collections.Generic namespaces

The following collections are available in both the System.Collections namespace and System.Collections.Generic namespace:

Comparer
SortedList
Stack

DictionaryEntry object

The DictionaryEntry object is used to store entries in a Hashtable collection.

IEnumerable and IDictionaryEnumerator interfaces

The IEnumerable and IDictionaryEnumerator interfaces are used to create a new collection type that must be iterated using a for each loop.

IClassFactory interface

The IClassFactory interface deals with two issues: locality and language independence. It provides a language-neutral way to create a COM object by a client.

AddRange

The AddRange method of the Control.ControlCollection class is used to add an array of controls to a collection. It is also used to add a single control to a collection.

ArrayList

The ArrayList class of the System.Collections namespace implements the IList interface by using an array of data.

SortedList object

It adds names to a SortedList object and retrieves the index number of a name.

Hashtable object

It retrieves values to their corresponding keys stored in a Hashtable object.

Dequeue

The Dequeue method of the Queue class is used to retrieve as well as remove an item at the beginning of a queue.

IsValid

The IsValid property of the CustomValidator control is used to indicate whether or not an input control passes validation.

LinkedList class

The LinkedList class is a doubly linked list. It is created dynamically as per the requirements. It comprises a sequence of nodes; each node in the LinkedList Generic class contains a data field and one or two references pointing to the next and/or the previous node.

LinkedList.Enumerator

The LinkedList.Enumerator is used to read all the data of a generic LinkedList. The LinkedList Generic class is a doubly linked list. It is created dynamically as per the requirements. It comprises a sequence of nodes, each node in the LinkedList Generic class contains a data field and one or two references pointing to the next and/or the previous node.

Ngen.exe

If an application calls a large number of methods or large shared libraries at startup, using pre-compilation is the best technique to optimize the performance of the application during startup. Pre-compiling the application with Native Image Generator (Ngen.exe) reduces its startup time.

CompareTo

The CompareTo method of the IComparable generic interface returns a 32-bit signed integer value that indicates the relative order of the objects that is to be compared.

StringDictionary

The StringDictionary class is used to store key and value pairs. When you create an instance of the specialized StringDictionary class, you can use only string indexes and set only values that are strings.

BitVector32 structure

The BitVector32 structure is used to provide a simple structure that stores boolean values and small integers in a 32-bit of memory size.

“= =” and Equals()

If two strings are equivalent, the “==” returns true, also the “Equals()” method returns true. When you use “==” operator with the string class it compares value rather than the identity.

Hybrid Dictionary

It manages collections and selects a class that is optimized for key-based item retrieval from both small and large collections using Hybrid Dictionary.

String concatenation

It is used to gather data from multiple email messages and format the data for display on the page and ensure that the page displays the data as quickly as possible.

Interface

An interface describes a group of related behaviors that can belong to a class or a struct.

Array.Sort and IComparer

Create a new collection type that must be sorted by using the Array.Sort and IComparer interface.

IConvertable interface

It converts the value of an object of an implementing type into a Common Language Runtime (CLR) type that has an equivalent value by using IConvertable interface.

EventArgs class

Create a class that inherits from the EventArgs class to pass specialized information to an event handler apart from the source and event handler objects.

Multiple events can share the same delegate

Multiple events can share the same delegate type. Once a delegate type is declared for an event, the event is declared as a delegate type field.

StackTrace

The StackTrace property is used to trace a stack at runtime. It is an ordered collection of one or more stack frames.

Event

A custom event can invoke a delegate.

PrintPageEventArgs

The PrintPageEventArgs class is used to provide data for the PrintPage event and it occurs when the output for the current page is needed.

EditCommand event

The EditCommand event of the DataGrid control occurs when users click the Edit button for a DataGrid item. The EditItemIndex property of the DataGrid control specifies the index of an item in the DataGrid control to edit.

TextBox event

The TextBox event handler is used to execute when the TextChanged event of the TextBox is raised. The TextChanged event of the TextBox control occurs when the Text property value is changed.

TextChanged event

When the TextChanged event of a TextBox control is fired, the text typed in one TextBox control will also appear in another TextBox control.

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Allen Ryan

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