ASP.NET Fundamentals

There is no file with the .asfx extension in ASP.NET.

RegularExpressionValidator control in ASP.NET is used to check the user input based on a pattern that we define using RegularExpression. If the value does not match with the RegularExpression, then an error message is displayed.

Application_Start() is fired when the first resource is requested from the web server and the web application starts. It allows us to create objects that accessible by all HttpApplication instances.

The PreLoad event is raised after the page loads view state for itself and all controls, and after it processes PostBack data that is included with the Request instance. We can process any kind of operation that we want before the page load.

The browser is responsible for managing cookies on a user system. Cookies are sent to the browser via the HttpResponse object that exposes a collection called Cookies.

This is not a valid directive for an ASP.NET page.

The App_Data folder is used as a data storage for the web application. It can store files such as .mdf, .mdb and XML. It manages all of our application's data centrally. It is accessible from anywhere in your web application.

A cookie is not an object but a small file that the server embeds on the user's computer. Whenever the same computer requests a page with a browser, it will send the cookie too.

The PlaceHolder Web server control allows us to place an empty container control within the page and then dynamically add, remove or loop through child elements at run time. The control renders only its child elements, it renders no markup of its own. In other words, the PlaceHolder control does not produce any visible output.

The PageTemplate is invalid template in Repeater Control.

The DataAdapter object acts as a mediator between the DataSet object and the database. This helps the data set to contain data from more than one databases or other data source. It must be provided with a set of data commands and a database connection used to fill the DataSet and update a database.

ViewState is a .NET mechanism to store the posted data among postbacks. ViewState allows the state of objects to be stored in a hidden field on the page, saved on client side and transported back to server whenever required.

Authentication is the process of getting credential from the user and validating them. There are 3 types of Authentication: Windows, Forms and Passport Authentication.

A user control is compiled at run time. When the compiler finds the register directive in a .aspx page that points to a user control, it compiles the control before it inserts its content into the .aspx page. The customer controls are compiled as DLL files.

This is an invalid property. The correct name of the property is NavigateUrl, which is used to point to the URL where the control will be transferred if the user clicks an advertisement.

The data is not visible in the URL. The Get method displays the data in the QueryString. This makes Post a safer choice than the Get method.

The System.Data.SqlClient namespace is the.NET Framework Data Provider for SQL Server. It describes a collection of classes used to access a SQL Server database in the managed space.

There can be multiple web.config file in multiple directories on an ASP.NET Web application server. Each Web.config file applies configuration settings to its own directory and all child directories.

The Abandon method destroys all the objects stored in a Session object and releases their resources. If you do not call the Abandon method explicitly, the server destroys these objects when the session times out.

As a part of Microsoft's .NET Framework, the Common Language Runtime (CLR) is programming that manages the execution of programs written in any of the several supported languages, allowing them to share common object-oriented classes written in any of the languages. A program compiled for the CLR does not need a language-specific execution environment and can easily be moved to and run on any system with Windows 2000 or Windows XP .

SOAP is an XML-based messaging framework specifically designed for exchanging formatted data across the internet. For example, using request and reply messages or sending entire documents. It is the best method for accessing a web service.

The users attribute in web.config allows two wild card characters: * and ?. Anonymous users are identified using a question mark (?). We can specify all authenticated users using an asterisk (*).

The System.Globalization namespace contains classes that define culture-related information, including language, country/region, calendars in use, format patterns for dates, currency and numbers, and sort order for strings.

The DetailsView control gives you the ability to display, edit, insert or delete a single record at a time from its associated data source. The DetailsView control displays only a single data record at a time.

Model View Controller or MVC as it is popularly called, is a software design pattern for developing web applications. A Model View Controller pattern is made up of the following three parts:
Model - The lowest level of the pattern which is responsible for maintaining the data.
View - This is responsible for displaying all or a portion of the data to the user.
Controller - Software Code that controls the interactions between the Model and View.