Web services enable interoperable communication between applications, allowing programs written in different languages like .NET and Java to interact. AJAX allows for asynchronous JavaScript calls to update parts of a web page without reloading, but has security and indexing disadvantages. Postback is the process of submitting user input from the client to the server for processing and returning the updated page.

1. INTERVIEW QUESTIONS ON ASP.NET

2. WHAT IS WEB SERVICE?
 Web service is a standard way of developing an
interoperable (ability of different applications to
communicate ) applications.
 It enables the application to invoke a method of
an another application.
 For example: Java app can interoperate with a
web service build using .NET

3. WHAT IS AJAX? WHAT ARE
ITS DISADVANTAGES ?
 AJAX is Asynchronous Javascript and XML.
 It is an platform independent technology which
helps to create responsive web applications.
 AJAX apps are less secure as all files are
downloaded at client side.
 AJAX web pages can not indexed by search
engines.
 AJAX app cannot be applicable with javascript
disabled browsers.

4. DEFINE POSTBACK
 Postback is the property of the page of sending
all the information from the client to the server
for processing and then posted back to the client.
 For exa: Consider login page, when user typed
user name and password and clicks on the login
button, data is submitted to the server to the
check against the database whether username
and password are correct and then posted back
to the client.

5. WHAT IS REPEATER?
 Repeater control is a data control used to
automate the collection of repeated list of items.
 Same as grid view.

6. WHAT ARE AJAX CONTROLS?
 ScriptManager:It is non visual component on the page.
 ScriptManagerProxy
 Timer: If we want to update the particular portion of the page
after some time irrespetive of user action.
 UpdatePanel: It defines the a region which is capable of making
partial page updates.
 UpdateProgress

7. WHAT ARE COOKIES?
 Cookies are the small amount of data stored on
the client web browser in the form of text file.
 They are used to identify a user.

8. JSON
 JSON is the Javascript Object Notations
 It is the syntax for storing and exchanging data.
 Alternative to XML.
 Language Independent.
 Compact way of transmitting data across network
connections.

9. WHAT IS DOM?
 DOM stands for Document Object Model
 Defines logical structure of the document and
the way a document is accessed.

10. WEB.CONFIG, APPSETTING
 Web.config file is the configuration file for asp.net
web application.
 <Appsettings >stores application configuration
information such as database connection string, file
paths, XML web service URL’s
 <configuration>
<appSettings> <add key="Title" value="B"/>
</appSettings>
</configuration>

11. EXPLAIN PAGE LIFE CYCLE IN ASP.