1. What data types do the RangeValidator controls support?
Integer, String, and Date.
Integer, String, and Date.
2. Where can I
download the .NET SDK?
.NET SDK can be obtained here. (You
have to install the Microsoft .NET Framework Version 1.1 Redistributable
Package before installing the .NET SDK.)
3. Are there any free
IDEs for the .NET SDK?
Microsoft provides Visual Studio
2005 Express Edition Beta for free. Of particular interest to the ASP.NET
developers would be the Visual Web Developer 2005 Express Edition Beta 2
available as a free download.
- The ASP.NET Web Matrix Project (supported by Microsoft) is a free IDE for developing ASP.NET applications and is available here.
- There is also a free open-source UNIX version of the Microsoft .NET development platform called Mono available for download here.
- Another increasingly popular Open Source Development Environment for .NET is the #develop (short for Sharp Develop) available for download here.
4. When was ASP.NET
released?
ASP.NET is a part of the .NET
framework which was released as a software platform in 2002.
5. What is Data
Binding?
Data binding is a way used to
connect values from a collection of data (e.g. DataSet) to the controls on a
web form. The values from the dataset are automatically displayed in the
controls without having to write separate code to display them.
6. Explain Namespace.
Namespaces are logical groupings
of names used within a program. There may be multiple namespaces in a single
application code, grouped based on the identifiers’ use. The name of any given
identifier must appear only once in its namespace.
7. List the types of
Authentication supported by ASP.NET.
1. Windows (default)
2. Forms
3. Passport
4. None (Security disabled)
8. What is CLR?
Common Language Runtime (CLR) is a run-time environment that
manages the execution of .NET code and provides services like memory
management, debugging, security, etc. The CLR is also known as Virtual
Execution System (VES).
9. What is CLI?
The CLI is a set of
specifications for a runtime environment, including a common type system, base
class library, and a machine-independent intermediate code known as the Common
Intermediate Language (CIL). (Source: Wikipedia.)
10. List the various
stages of Page-Load lifecycle.
1. Init()
2. Load()
3. PreRender()
4. Unload()
11. Explain Assembly
and Manifest.
An assembly is a collection of
one or more files and one of them (DLL or EXE) contains a special metadata
called Assembly Manifest. The manifest is stored as binary data and contains
details like versioning requirements for the assembly, the author, security
permissions, and list of files forming the assembly. An assembly is created
whenever a DLL is built. The manifest can be viewed programmatically by making
use of classes from the System.Reflection namespace. The tool Intermediate
Language Disassembler (ILDASM) can be used for this purpose. It can be launched
from the command prompt or via Start> Run.
12. What is Shadow
Copy?
In order to replace a COM
component on a live web server, it was necessary to stop the entire website,
copy the new files and then restart the website. This is not feasible for the
web servers that need to be always running. .NET components are different. They
can be overwritten at any time using a mechanism called Shadow Copy. It
prevents the Portable Executable (PE) files like DLLs and EXEs from being
locked. Whenever new versions of the PEs are released, they are automatically
detected by the CLR and the changed components will be automatically loaded.
They will be used to process all new requests not currently executing, while
the older version still runs the currently executing requests. By bleeding out
the older version, the update is completed.
13. What is DLL Hell?
DLL hell is the problem that
occurs when an installation of a newer application might break or hinder other
applications as newer DLLs are copied into the system and the older
applications do not support or are not compatible with them. .NET overcomes this
problem by supporting multiple versions of an assembly at any given time. This
is also called side-by-side component versioning.
14. Explain Web
Services.
Web services are programmable
business logic components that provide access to functionality through the
Internet. Standard protocols like HTTP can be used to access them. Web services
are based on the Simple Object Access Protocol (SOAP), which is an application
of XML. Web services are given the .asmx extension.
16. Explain Windows
Forms.
Windows Forms is employed for
developing Windows GUI applications. It is a class library that gives
developer’s access to Windows Common Controls with rich functionality. It is a
common GUI library for all the languages supported by the .NET Framework.
17. What is Postback?
When an action occurs (like
button click), the page containing all the controls within the <FORM... >
tag performs an HTTP POST, while having itself as the target URL. This is
called Postback.
18. Explain the
differences between server-side and client-side code?
Server side scripting means that
all the script will be executed by the server and interpreted as needed. Client
side scripting means that the script will be executed immediately in the
browser such as form field validation, clock, email validation, etc. Client
side scripting is usually done in VBScript or JavaScript. Since the code is
included in the HTML page, anyone can see the code by viewing the page source.
It also poses as a possible security hazard for the client computer.
19. Enumerate the
types of Directives.
1. @ Page directive
2. @ Import directive
3. @ Implements directive
4. @ Register directive
5. @ Assembly directive
6. @ OutputCache directive
7. @ Reference directive
20. What is
Code-Behind?
Code-Behind is a concept where
the contents of a page are in one file and the server-side code is in another.
This allows different people to work on the same page at the same time and also
allows either part of the page to be easily redesigned, with no changes
required in the other. An Inherits attribute is added to the @ Page directive
to specify the location of the Code-Behind file to the ASP.NET page.
21. Describe the
difference between inline and code behind.
Inline code is written alongside
the HTML in a page. There is no separate distinction between design code and
logic code. Code-behind is code written in a separate file and referenced by
the .aspx page.
22. List the ASP.NET
validation controls?
1. RequiredFieldValidator
2. RangeValidator
3. CompareValidator
4. RegularExpressionValidator
5. CustomValidator
6. ValidationSummary
23. Describe Paging
in ASP.NET.
The DataGrid control in ASP.NET
enables easy paging of the data. The AllowPaging property of the DataGrid can
be set to True to perform paging. ASP.NET automatically performs paging and
provides the hyperlinks to the other pages in different styles, based on the
property that has been set for PagerStyle.Mode.
24. Should user input
data validation occur server-side or client-side? Why?
All user input data validation
should occur on the server and minimally on the client-side, though it is a
good way to reduce server load and network traffic because we can ensure that
only data of the appropriate type is submitted from the form. It is totally
insecure. The user can view the code used for validation and create a
workaround for it. Secondly, the URL of the page that handles the data is
freely visible in the original form page. This will allow unscrupulous users to
send data from their own forms to your application. Client-side validation can
sometimes be performed where deemed appropriate and feasible to provide a
richer, more responsive experience for the user.
25. What is the
difference between Server.Transfer and Response.Redirect?
Response.Redirect: This tells the browser that the requested page
can be found at a new location. The browser then initiates another request to
the new page loading its contents in the browser. This results in two requests
by the browser.
Server.Transfer: It transfers execution from the first page to the
second page on the server. As far as the browser client is concerned, it made
one request and the initial page is the one responding with content. The
benefit of this approach is one less round trip to the server from the client
browser. Also, any posted form variables and query string parameters are
available to the second page as well.
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