What is the transport protocol you use to call a Web
service?
Answer1:
SOAP. Transport Protocols: It is essential for the
acceptance of Web Services that they are based on
established Internet infrastructure. This in fact
imposes the usage of of the HTTP, SMTP and FTP protocols
based on the TCP/IP family of transports. Messaging
Protocol: The format of messages exchanged between Web
Services clients and Web Services should be vendor
neutral and should not carry details about the
technology used to implement the service. Also, the
message format should allow for extensions and different
bindings to specific transport protocols. SOAP and ebXML
Transport are specifications which fulfill these
requirements. We expect that the W3C XML Protocol
Working Group defines a successor standard.
Answer2:
SOAP is not the transport protocol. SOAP is the data
encapsulation protocol that is used but the transport
protocol is fairly unlimited. Generally HTTP is the most
common transport protocol used though you could
conceivanly use things like SMTP or any others. SOAP is
not dependant on any single transport protocol or OS, it
is a syntactical and logical definition, not a transport
protocol.
True or False: A Web service can only be written in
.NET.?
False.
What does WSDL stand for?
Web Services Description Language
Where on the Internet would you look for Web services?
UDDI repositaries like uddi.microsoft.com, IBM UDDI
node, UDDI Registries in Google Directory, enthusiast
sites like XMethods.net.
What tags do you need to add within the asp:datagrid
tags to bind columns manually?
Column tag and an ASP:databound tag.
How is a property designated as read-only?
In VB.NET:
Public ReadOnly Property PropertyName As ReturnType
Get ‘Your Property Implementation goes in here
End Get
End Property
in C#
public returntype PropertyName
{
get{
//property implementation goes here
}
// Do not write the set implementation
}
Which control would you use if you needed to make sure
the values in two different controls matched?
Use the CompareValidator control to compare the values
of 2 different controls.
True or False: To test a Web service you must create a
windows application or Web application to consume this
service?
False.
How many classes can a single .NET DLL contain?
Unlimited.
Describe session handling in a webfarm, how does it work
and what are the limits?
Set the sessionState mode in the web.config file to “StateServer”.
StateServer mode uses an out-of-process Windows NT
Server to store state information.
It solves the session state loss problem in InProc mode.
Allows a webfarm to store session on a central server.
It provides a Single point of failure at the State
Server.
Follow these simple steps:
- In a web farm, make sure you have the same in all your
web servers.
- Also, make sure your objects are serializable.
- For session state to be maintained across different
web servers in the web farm, the Application Path of the
website in the IIS Metabase should be identical in all
the web servers in the web farm.
What are the disadvantages of viewstate/what are the
benefits?
Answer1:
Disadvantage of viewstate is that additional data is
sent to the browser. The benefits are that you do not
have to manually manage refreshing the page fields after
a submit, (when re-displaying the same page).
Answer2:
Automatic view-state management is a feature of server
controls that enables them to repopulate their property
values on a round trip (without you having to write any
code). This feature does impact performance, however,
since a server control’s view state is passed to and
from the server in a hidden form field. You should be
aware of when view state helps you and when it hinders
your page’s performance.
What tags do you need to add within the asp:datagrid
tags to bind columns manually?
Answer1:
Set AutoGenerateColumns Property to false on the
datagrid tag
Answer2:
tag and either or tags (with appropriate attributes of
course)
What is State Management in .Net and how many ways are
there to maintain a state in .Net? What is view state?
Web pages are recreated each time the page is posted to
the server. In traditional Web programming, this would
ordinarily mean that all information associated with the
page and the controls on the page would be lost with
each round trip.
To overcome this inherent limitation of traditional Web
programming, the ASP.NET page framework includes various
options to help you preserve changes — that is, for
managing state. The page framework includes a facility
called view state that automatically preserves property
values of the page and all the controls on it between
round trips.
However, you will probably also have
application-specific values that you want to preserve.
To do so, you can use one of the state management
options.
Client-Based State Management Options:
View State
Hidden Form Fields
Cookies
Query Strings
Server-Based State Management Options
Application State
Session State
Database Support
What tag do you use to add a hyperlink column to the
DataGrid?
Depends on who’s definition of hyperlink your using.
Manually a std html anchor tag (a) will work or you can
use the micro-magical tag
What is the standard you use to wrap up a call to a Web
service?
Several possible answers depending on your
interpretation of the quesiton, but I think you were
aiming for SOAP (with the caveat that this is MS’s
version of SOAP)
What is the difference between boxing and unboxing ?
Boxing allows us to convert value types to reference
types. Basically, the runtime creates a temporary
reference-type box for the object on heap.
Eg:
int i=20;
object o=i;
Describe the difference between a Thread and a Process?
Answer1:
Thread - is used to execute more than one program at a
time.
process - executes single program
Answer2:
A thread is a path of execution that run on CPU, a
proccess is a collection of threads that share the same
virtual memory. A process have at least one thread of
execution, and a thread always run in a process context.
Answer3:
The operating system creates a process for the purpose
of running a program. Each process executes a single
program. Processes own resources allocated by the
operating system. Resources include memory, file
handles, sockets, device handles, and windows. Processes
do not share address spaces or file resources except
through explicit methods such as inheriting file handles
or shared memory segments, or mapping the same file in a
shared way.
Threads allow a program to do multiple things
concurrently. At least one thread exists within each
process. If multiple threads can exist within a process,
then they share the same memory and file resources.
Answer4:
Thread is a light weight process, which is initialized
itself by a process. Light weigt processes does not
loads resources required by it itself, these are loaded
by its parent process which has generated it.
What is a Windows Service and how does its lifecycle
differ from a “standard” EXE?
Windows Service applications are long-running
applications that are ideal for use in server
environments. The applications do not have a user
interface or produce any visual output; it is instead
used by other programs or the system to perform
operations. Any user messages are typically written to
the Windows Event Log. Services can be automatically
started when the computer is booted. This makes services
ideal for use on a server or whenever you need
long-running functionality that does not interfere with
other users who are working on the same computer. They
do not require a logged in user in order to execute and
can run under the context of any user including the
system. Windows Services are controlled through the
Service Control Manager where they can be stopped,
paused, and started as needed.
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