Important Interview Tips in ASP.NET
1. Explain page directives?
The first line of an Asp.Net page is the page directive; you can see it on all Asp.Net pages. These directives are instructions for the page. It starts with the @Page directive and continues with the different attributes available to this directive list.
The basic syntax for a Page directive is:
<%@ Page Title="Home
Page" Language="C#" MasterPageFile="~/Site.master"
AutoEventWireup="true" CodeBehind="Default.aspx.cs"
Inherits="WebApplication1._Default" %>
The attributes of the
Page directive are:
Title
Specifies a title for the page that is rendered within the HTML <title>
tags in the response. The title can also be accessed programmatically as a
property of the page.
Language
Specifies the language used when compiling all inline rendering (<% %>
and <%= %>) and code declaration blocks within the page, From VB.net, C#.net, Jscript only one language can be used per page.
MasterPageFile
Sets the path to the master page for the content page or nested master page
AutoEventWireup
Indicates whether the page's events are autowired. true if event autowiring is
enabled; otherwise, false.
CodeBehind name of the code behind
file
Inherits the name of the code
behind or other class
2. Hyperlink Vs LinkButton in ASP.NET?
A Hyperlink just redirects to a given URL
identified by “NavigateURL” property. LinkButton which actually displays a
Hyperlink style button causes a postback to the same page but it doesn’t
redirect to a given URL.
3. Label Control Vs Literal Control in ASP.NET?
A Label control in ASP.NET renders text inside
<span> tags while a Literal Control renders just the text without any
tags.
With Label controls we can easily apply styles using it’s CssClass property, however, if we don’t want to apply style/formatting, it’s better to go for a Literal control.
With Label controls we can easily apply styles using it’s CssClass property, however, if we don’t want to apply style/formatting, it’s better to go for a Literal control.
4. Difference between WCF and ASMX Web Services?
Web service is designed to send and receive
messages using SOAP over HTTP only. While WCF can exchange messages using any
format (SOAP is default) over any transport protocol (HTTP, TCP/IP, MSMQ,
NamedPipes etc.
Web Services WCF
Hosted in IIS only Hosted
in IIS, WAS, Console, WinNT Services, WCF provided
Host Support for HTTP only Support for HTTP, TCP, MSMQ, Named Pipes
Limited Security A
consistent security Programming Model
Uses XMSerializer uses
DataContractSerializer
5. Custom controls Vs User controls in ASP.NET?
Custom
controls are basically compiled code i.e. DLLs. These can be easily added to
toolbox, so it can be easily used across multiple projects using drag and drop
approach. These controls are comparatively hard to create.
User
Controls (.ascx) are just like pages (.aspx). These are comparatively easy to
create but tightly couple with respect to User Interface and code. In order to
use across multiple projects, we need to copy and paste to the other project as
well.
6. Difference between a Postback and a Callback in ASP.NET?
A
postback is a request sent from a client to server from the same page,
user is already working with.
A
callback is generally a call for execution of a function after another
function has completed.
7. Explain Global.asax in ASP.NET?
Global.asax is basically ASP.NET Application file. It’s a
place to write code for Application-level events such as Application start,
Application end, Session start , Session end, Application error, Application
begin request,, Application end request etc.
8. Can we Enable/Disable ViewState?
Yes, ViewState can be enabled or disable at
different levels:
Control Level ViewState for a specific control can be enabled or disabled by setting
EnableViewState property
aControl.EnableViewState = false;
Page Level we can enable/disable
ViewState for a complete page
<%@ Page
Language=”C#” EnableViewState=”false” %>
Application Level For whole application, we can enable/disable views in
configuration file
<pages
enableViewState=”false”>
….
</pages>
9. Difference between Globalization Vs Localization
When we need to create an application that work for multiple
cultures e.g en-US, ar-SAetc, the process of designing and building applications that
work on more than one cultures is called globalization. However, customizing an
application for a specific culture is localization.
10. Session.Clear() Vs Session.Abandon() in ASP.NET?
Session.Clear() clears all the session values but
doesn’t destroy the Session.
Session.Clear() is like deleting all
files inside a folder (say “Root”)
Session.Abandon() destroys
the session object.
Session.Abandon() means deleting the
“Root” folder.
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