Insert integer, string Inserts an item at the specified index location in the collection and assigns string parameter to the text property of the item. Insert integer, ListItem Inserts the item at the specified index location in the collection.
Remove string Removes the item with the text value same as the string. Remove ListItem Removes the specified item. RemoveAt integer Removes the item at the specified index as the integer. Clear Removes all the items of the collection. FindByValue string Returns the item whose value is same as the string. FindByValue Text Returns the item whose text is same as the string.
A check box list presents a list of independent options. These controls contain a collection of ListItem objects that could be referred to through the Items property of the control. The default is Table. RepeatDirection It specifies the direction in which the controls to be repeated. The values available are Horizontal and Vertical. Default is Vertical. RepeatColumns It specifies the number of columns to use when repeating the controls; default is 0.
NET Text The text to be displayed as the link. Target The window or frame which loads the linked page. Image Control The image control is used for displaying images on the web page, or some alternative text, if the image is not available.
ImageAlign Alignment options for the control. ImageUrl Path of the image to be displayed by the control. NET directives are instructions to specify optional settings, such as registering a custom control and page language.
These settings describe how the web forms. NET directives and we will use most of these directives throughout the tutorials. The Application Directive The Application directive defines application-specific attributes. It is provided at the top of the global.
Parsers and compilers ignore this. Language The language used in code blocks. The Assembly Directive The Assembly directive links an assembly to the page or the application at parse time. This could appear either in the global. ClassName The file name for the control. Debug The Boolean value that enables or disables compiling with debug symbols Description The text description of the control page, ignored by compiler.
EnableViewState The Boolean value that indicates whether view state is maintained across page requests Explicit For VB language, tells the compiler to use option explicit mode Inherits The class from which the control page inherits.
NET Language The language for code and script. Src The filename for the code-behind class. Strict For VB language, tells the compiler to use the option strict mode. The Implements Directive The Implement directive indicates that the web page, master page or user control page must implement the specified. Net framework interface. If the Import directive is specified in the global. If it is in a page of user control page, then it is applied to that page or control.
ClassName The class name for the page. ClientTarget The browser for which the server controls should render content. CodeFile The name of the code behind file.
Debug The Boolean value that enables or disables compilation with debug symbols. NET Description The text description of the page, ignored by the parser. EnableSessionState It enables, disables, or makes session state read-only. EnableViewState The Boolean value that enables or disables view state across page requests. ErrorPage URL for redirection if an unhandled page exception occurs.
Inherits The name of the code behind or other class. Language The programming language for code. Src The file name of the code behind class. Trace It enables or disables tracing. TraceMode It indicates how trace messages are displayed, and sorted by time or category. Transaction It indicates if transactions are supported.
ValidateRequest The Boolean value that indicates whether all input data is validated against a hardcoded list of values. When the client disconnects from the server, the ASP. NET engine discards the page objects. This way, each web application can scale up to serve numerous requests simultaneously without running out of server memory. However, there needs to be some technique to store the information between requests and to retrieve it when required. This information i.
It is automatically maintained across posts by ASP. NET framework. EnableViewState property. It is implemented using a view state object defined by the StateBag class which defines a collection of view state items. The state bag is a data structure containing attribute-value pairs, stored as strings associated with objects. NET Item name The value of the view state item with the specified name.
This is the default property of the StateBag class. Count The number of items in the view state collection. Keys Collection of keys for all the items in the collection. Values Collection of values for all the items in the collection. The StateBag class has the following methods: Methods Description Add name, value Adds an item to the view state collection and existing item is updated. Clear Removes all the items from the collection. Finalize Allows it to free resources and perform other cleanup operations.
Remove name Removes the specified item. Example The following example demonstrates the concept of storing view state. Let us keep a counter, which is incremented each time the page is posted back by clicking a button on the page. A label control shows the value in the counter. NET website, a new session object is created. When session state is turned on, a new session state object is created for each new request. This session state object becomes part of the context and it is available through the page.
Session state is generally used for storing application data such as inventory, supplier list, customer record, or shopping cart. It can also keep information about the user and his preferences, and keep the track of pending operations. Sessions are identified and tracked with a bit SessionID, which is passed from client to server and back as cookie or a modified URL. The SessionID is globally unique and random. The session state object is created from the HttpSessionState class, which defines a collection of session state items.
Item name The value of the session state item with the specified name. This is the default property of the HttpSessionState class. Count The number of items in the session state collection. NET TimeOut Gets and sets the amount of time, in minutes, allowed between requests before the session-state provider terminates the session.
The HttpSessionState class has the following methods: Methods Description Add name, value Adds an item to the session state collection. Clear Removes all the items from session state collection. Remove name Removes the specified item from the session state collection. RemoveAll Removes all keys and values from the session-state collection. RemoveAt Deletes an item at a specified index from the session-state collection.
The session state object is a name-value pair to store and retrieve some information from the session state object. NET The above code stores only strings in the Session dictionary object, however, it can store all the primitive data types and arrays composed of primitive data types, as well as the DataSet, DataTable, HashTable, and Image objects, as well as any user- defined class that inherits from the ISerializable object.
Example The following example demonstrates the concept of storing session state. There are two buttons on the page, a text box to enter string and a label to display the text stored from last session. Text; this. NET application is the collection of all web pages, code and other files within a single virtual directory on a web server.
When information is stored in application state, it is available to all the users. To provide for the use of application state, ASP. This object is represented by class file global. Application State is mostly used to store hit counters and other statistical data, global application data like tax rate, discount rate etc.
The HttpApplicationState class has the following properties: Properties Description Item name The value of the application state item with the specified name. This is the default property of the HttpApplicationState class. Count The number of items in the application state collection.
The HttpApplicationState class has the following methods: Methods Description Add name, value Adds an item to the application state collection. Clear Removes all the items from the application state collection. NET Remove name Removes the specified item from the application state collection. Lock Locks the application state collection so only the current user can access it.
Unlock Unlocks the application state collection so all the users can access it. Therefore, it would help to take a look at the properties and the methods of this base class, which are common for all the validation controls: Members Description ControlToValidate Indicates the input control to validate.
Display Indicates how the error message is shown. EnableClientScript Indicates whether client side validation will take. Enabled Enables or disables the validator. ErrorMessage Indicates error string. Text Error text to be shown if validation fails. IsValid Indicates whether the value of the control is valid. SetFocusOnError It indicates whether in case of an invalid control, the focus should switch to the related input control.
Validate This method revalidates the control and updates the IsValid property. It is generally tied to a text box to force input into the text box. It has three specific properties: Properties Description Type It defines the type of the data.
MinimumValue It specifies the minimum value of the range. MaximumValue It specifies the maximum value of the range. It has the following specific properties: Properties Description Type It specifies the data type. ControlToCompare It specifies the value of the input control to compare with. ValueToCompare It specifies the constant value to compare with. The regular expression is set in the ValidationExpression property. Metacharacters Description. Quantifiers could be added to specify number of times a character could appear.
The client side validation is accomplished through the ClientValidationFunction property. The client side validation routine should be written in a scripting language, such as JavaScript or VBScript, which the browser can understand. The server side validation routine should be written in any. Net language, like C or VB. The summary displays the values of the ErrorMessage property of all validation controls that failed validation. In such situation, a need might arise for performing validation separately for separate group.
This kind of situation is handled using validation groups. To create a validation group, you should put the input controls and the validation controls into the same logical group by setting their ValidationGroup property.
NET The following example describes a form to be filled up by all the students of a school, divided into four houses, for electing the school president. Here, we use the validation controls to validate the user input.
NET hides the complex processes of data access and provides much higher level of classes and objects through which data is accessed easily. These classes hide all complex coding for connection, data retrieving, data querying, and data manipulation. NET control objects and the backend data source. In this tutorial, we will look at data access and working with the data in brief.
We will discuss the data binding and data source controls in detail later. In this section, we will use a SqlDataSource control to access data and a GridView control to display and manipulate data in this chapter. We will also use an Access database, which contains the details about.
Net books available in the market. At the next step, you are asked to configure the select statement: 5 Select the columns and click next to complete the steps. NET where clause, order by clause, and specify the insert, update, and delete commands of SQL respectively. This way, you can manipulate the data. Choose the data source and format the control using AutoFormat option.
NET 8 Finally execute the application. NET provides a bridge between the front end controls and the back end database. NET objects encapsulate all the data access operations and the controls interact with these objects to display data, thus hiding the details of movement of data. The following figure shows the ADO. It does not have a continuous connection to the database. To update the database a reconnection is required. The DataRelation objects represent the relationship between two tables.
Container Gets the container for the component. DataSetName Gets or sets the name of the current data set. DefaultViewManager Returns a view of data in the data set. DesignMode Indicates whether the component is currently in design mode. EnforceConstraints Indicates whether constraint rules are followed when attempting any update operation.
Events Gets the list of event handlers that are attached to this component. ExtendedProperties Gets the collection of customized user information associated with the DataSet. HasErrors Indicates if there are any errors. IsInitialized Indicates whether the DataSet is initialized. Locale Gets or sets the locale information used to compare strings within the table. Namespace Gets or sets the namespace of the DataSet.
Relations Returns the collection of DataRelation objects. Tables Returns the collection of DataTable objects.
BeginInit Begins the initialization of the DataSet. The initialization occurs at run time. Clear Clears data. Clone Copies the structure of the DataSet, including all DataTable schemas, relations, and constraints. Does not copy any data. Copy Copies both structure and data. EndInit Ends the initialization of the data set. Equals Object Determines whether the specified Object is equal to the current Object. Finalize Free resources and perform other cleanups.
GetChanges Returns a copy of the DataSet with all changes made since it was loaded or the AcceptChanges method was called. GetObjectData Populates a serialization information object with the data needed to serialize the DataSet. HasChanges Gets a value indicating whether the DataSet has changes, including new, deleted, or modified rows.
NET strings to supply the names for the tables within the DataSet. Merge Merges the data with data from another DataSet. This method has different overloaded forms.
RejectChanges Rolls back all changes made since the last call to AcceptChanges. It has the following important properties; most of these properties are read only properties except the PrimaryKey property: Properties Description ChildRelations Returns the collection of child relationship.
Columns Returns the Columns collection. Constraints Returns the Constraints collection. DataSet Returns the parent DataSet. ParentRelations Returns the ParentRelations collection. PrimaryKey Gets or sets an array of columns as the primary key for the table. Rows Returns the Rows collection. Clear Clears all data from the table. GetErrors Returns an array of rows with errors.
ImportRows Copies a new row into the table. LoadDataRow Finds and updates a specific row, or creates a new one, if not found any. Merge Merges the table with another DataTable. NewRow Creates a new DataRow. Reset Resets the table to its original state. Select Returns an array of DataRow objects. It has the following important properties: Properties Description HasErrors Indicates if there are any errors.
Items Gets or sets the data stored in a specific column. ItemArrays Gets or sets all the values for the row. Table Returns the parent table.
The following table shows some important methods of the DataRow class: Methods Description AcceptChanges Accepts all changes made since this method was called. BeginEdit Begins edit operation. CancelEdit Cancels edit operation. Delete Deletes the DataRow. EndEdit Ends the edit operation. GetChildRows Gets the child rows of this row. GetParentRow Gets the parent row. This helps the Dataset to contain data from multiple databases or other data source. This object provides a connection oriented access to the data records in the database.
These objects are suitable for read-only access, such as populating a list and then breaking the connection. The connection could be shared among different command objects. The DbCommand object represents the command or a stored procedure sent to the database from retrieving or manipulating data.
Example So far, we have used tables and databases already existing in our computer. In this example, we will create a table, add column, rows and data into it and display the table using a GridView object. Tables["Student"]; GridView1. Add columnName, Type. NET has two controls that allow users to upload files to the web server.
Once the server receives the posted file data, the application can save it, check it, or ignore it. NET web control Both controls allow file uploading, but the FileUpload control automatically sets the encoding of the form, whereas the HtmlInputFile does not do so. In this tutorial, we use the FileUpload control. The FileUpload control allows the user to browse for and select the file to be uploaded, providing a browse button and a text box for entering the filename.
Once the user has entered the filename in the text box by typing the name or browsing, the SaveAs method of the FileUpload control can be called to save the file to the disk. Apart from those, the FileUpload class has the following read-only properties: Properties Description FileBytes Returns an array of the bytes in a file to be uploaded.
FileContent Returns the stream object pointing to the file to be uploaded. FileName Returns the name of the file to be uploaded. HasFile Specifies whether the control has a file to upload.
PostedFile Returns a reference to the uploaded file. The posted file is encapsulated in an object of type HttpPostedFile, which could be accessed through the PostedFile property of the FileUpload class. FileName Returns the full filename. InputStream Returns a stream object pointing to the uploaded file.
Example The following example demonstrates the FileUpload control and its properties. The form has a FileUpload control along with a save button and a label control for displaying the file name, file type, and file length.
FileName ; sb. ContentType ; sb. ContentLength ; sb. NET sb. IO namespace, so it needs to be included. This external XML schedule file is called the advertisement file.
The AdRotator control allows you to specify the advertisement file and the type of window that the link should follow in the AdvertisementFile and the Target property respectively. The Advertisement File The advertisement file is an XML file, which contains the information about the advertisements to be displayed. It is a text-based markup language that enables you to store data in a structured format by using meaningful tags.
The term 'extensible' implies that you can extend your ability to describe a document by defining meaningful tags for the application. It is a meta-markup language. NET performs faster than any popular web framework in the independent TechEmpower benchmarks. Data sourced from official tests available at TechEmpower Round NET supports industry standard authentication protocols. NET provides a built-in user database with support for multi-factor authentication and external authentication with Google, Twitter, and more.
NET forums , and more. NET is open source on GitHub, with over , contributions and 3, companies already contributing. Join the. NET community. You can also deploy to any major cloud platform, your own Linux or Windows servers, or one of many hosting providers.
Host for free with Azure. The main objective of. NET Core is to make. NET Framework open-source, cross-platform compatible that can be used in a wide variety of verticals, from the data center to touched-based devices.
Open-source Framework:. You can view, download, or contribute to the source code using the following GitHub repositories:. There is different runtime for each operating system that executes the code and generates the same output.
Consistent across Architecture: Execute the code with the same behavior in different instruction set architectures, including x64, x86, and ARM. Wide range of Applications: Various types of applications can be developed and run on. NET Core applications. Modular Architecture:. There are different NuGet Packages available for various features that can be added to the.
NET Core project as needed. Even though the. CLI Tools:. Flexible Deployment:. Compatibility: Compatible with. NET Standard Specification. Developer s :.
NET Core 1. NET Core 3. NET 5. NET Core 2. Note: The next release after. NET Framework will be deprecated, and. NET 5 will be the only. NET Framework 4. The first preview of. NET 5 was released on March 16th, All of these resources can help students to be better prepared for any upcoming exam on the subject. It is a developer platform that is made up of a programming model which is a complicated software infrastructure that can be used to make web applications for pc.
It uses various Http commands, and policies to set a browser-to-server bilateral communication and cooperation. Since ASP. NET is a part of the Microsoft. Net platform, it is used to compile different codes and writes extensively. Reusable components of or objected that are presented in the framework.
NET provides various work. It is used to provide an alternative option to ASP. NET and other study material in this article. Here students are provided with the best resources required to study the asp. The notes of asp. By using asp. Given below is the list of notes to download and prepare all the server side and client side classic asp.
Using the right reference books can help as better resource material which can assist students to understand the subject better. The reference books provided by this article give students the best material to fact-check their queries and understand the subject with the right information. Here in this article, the books provided by experts allow students to thorough down on their basic concepts. Here Aspirants can use these reference books and study material during their time of preparation to score their desired grades.
Unit 3 ASP. Apply themes and Profiles.
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