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An interface is not a class but an object with a set of methods. The method inside an interface has only method definitions without ant body. An interface is used to implement multiple inheritance in code. This feature of an interface is quite different from that of abstract classes because a class cannot derive the features of more than one class but can easily implement multiple interfaces. Variables in interface must be declared as public, static, and final while methods must be public and abstract.
An abstract class is a class that cannot be instantiated and is always used as a base class. We cannot instantiate an abstract class directly. This implies that we cannot create an object of the abstract class; it must be inherited. We can have abstract as well as non-abstract members in an abstract class. We must declare at least one abstract method in the abstract class. An abstract class is always public. An abstract class is declared using the abstract keyword. The basic purpose of an abstract class is to provide a common definition of the base class that multiple derived classes can share.
There two types of connection in Ado.Net.They are connected Architecture and disconnected architecture:
Yes. Just declare the class public and make the method sealed.
View State is one of the state management methods used to retain the page and it's control values between post backs. It Store the values of page or control properties that you define. One bit of state that does not need to be persisted across post-backs is the control's properties specified in the declarative syntax, since they are automatically reinstated in the page's instantiate stage. View State is a client side state management.
Session is more secure than View State as it is stored in server side memory and creates a unique session id for each session.
Finalize method is implicitly called by GarbageCollector to delete the object if it is no longer in use whereas Dispose method is explicitly called inside a class through IDisposible interface to forcefully remove the object and its references.
Delegate is an object that holds the reference to methods in c#. It is same as a function pointer in C.
An assembly exists as a .DLL or .EXE that contains MSIL code that is executed by CLR. An assembly contains interface and classes, it can also contain other resources like bitmaps, files etc. It carries version details which are used by the CLR during execution. Two assemblies of the same name but with different versions can run side-by-side enabling applications that depend on a specific version to use assembly of that version.
A custom control is a loosely coupled control which can be used across various applications.
We need to only include its reference (.dll) to the project and it can be added to your toolbox.You can also keep it inside a class library.
Main difference between User Controls and Custom Controls are:
A postback is a request sent from a client to server from the same page user is already working with. When we refresh our page or we submit some page, then the data of the current page is send back to the server.
Client-side state management: This maintains information on the client's machine using Cookies, View State, and Query Strings.
Cookies: A cookie is a small text file on the client machine either in the client's file system or memory of client browser session. Cookies are not good for sensitive data. Moreover, Cookies can be disabled on the browser. Thus, you can't rely on cookies for state management.
View State: Each page and each control on the page has View State property. This property allows automatic retention of page and controls state between each trip to server. This means control value is maintained between page postbacks. Viewstate is implemented using _VIEWSTATE, a hidden form field which gets created automatically on each page. You can't transmit data to other page using view state.
Querystring: Query strings can maintain limited state information. Data can be passed from one page to another with the URL but you can send limited size of data with the URL. Most browsers allow a limit of 255 characters on URL length.
Server-side state management: This kind of mechanism retains state in the server.
Application State: The data stored in the application object can be shared by all the sessions of the application. Application object stores data in the key value pair.
Session State: Session State stores session-specific information and the information is visible within the session only. ASP.NET creates unique sessionId for each session of the application. SessionIDs are maintained either by an HTTP cookie or a modified URL, as set in the application's configuration settings. By default, SessionID values are stored in a cookie.
Database: Database can be used to store large state information. Database support is used in combination with cookies or session state.
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