- What’s the difference between Response.Write()
andResponse.Output.Write()?
Response.Output.Write() allows you to write
formatted output.
- What methods are fired during the page load?
Init() - when the
page is instantiated
Load() - when the page is loaded into server
memory
PreRender() - the brief moment before the page is displayed to the
user as HTML
Unload() - when page finishes loading.
- When during the page processing cycle is ViewState
available?
After the Init() and before the Page_Load(), or OnLoad() for a
control.
- What namespace does the Web page belong in the .NET Framework class
hierarchy?
System.Web.UI.Page
- Where do you store the information about the user’s
locale?
System.Web.UI.Page.Culture
- What’s the difference between Codebehind="MyCode.aspx.cs"
andSrc="MyCode.aspx.cs"?
CodeBehind is relevant to Visual Studio.NET
only.
- What’s a bubbled event?
When you have a complex control, like
DataGrid, writing an event processing routine for each object (cell, button,
row, etc.) is quite tedious. The controls can bubble up their eventhandlers,
allowing the main DataGrid event handler to take care of its constituents.
- Suppose you want a certain ASP.NET function executed on MouseOver for a
certain button. Where do you add an event handler?
Add an OnMouseOver
attribute to the button. Example:
btnSubmit.Attributes.Add("onmouseover","someClientCodeHere();");
- What data types do the RangeValidator control support?
Integer,
String, and Date.
- Explain the differences between Server-side and Client-side
code?
Server-side code executes on the server. Client-side code executes
in the client's browser.
- What type of code (server or client) is found in a Code-Behind
class?
The answer is server-side code since code-behind is executed on
the server. However, during the code-behind's execution on the server, it can
render client-side code such as JavaScript to be processed in the clients
browser. But just to be clear, code-behind executes on the server, thus making
it server-side code.
- Should user input data validation occur server-side or client-side?
Why?
All user input data validation should occur on the server at a
minimum. Additionally, client-side validation can be performed where deemed
appropriate and feasable to provide a richer, more responsive experience for the
user.
- What is the difference between Server.Transfer and Response.Redirect? Why
would I choose one over the other?
Server.Transfer transfers page
processing from one page directly to the next page without making a round-trip
back to the client's browser. This provides a faster response with a little less
overhead on the server. Server.Transfer does not update the clients url history
list or current url. Response.Redirect is used to redirect the user's browser to
another page or site. This performas a trip back to the client where the
client's browser is redirected to the new page. The user's browser history list
is updated to reflect the new address.
- Can you explain the difference between an ADO.NET Dataset and an ADO
Recordset?
Valid answers are:
· A DataSet can represent an entire
relational database in memory, complete with tables, relations, and views.
·
A DataSet is designed to work without any continuing connection to the original
data source.
· Data in a DataSet is bulk-loaded, rather than being loaded on
demand.
· There's no concept of cursor types in a DataSet.
· DataSets have
no current record pointer You can use For Each loops to move through the
data.
· You can store many edits in a DataSet, and write them to the original
data source in a single operation.
· Though the DataSet is universal, other
objects in ADO.NET come in different versions for different data sources.
- What is the Global.asax used for?
The Global.asax (including the
Global.asax.cs file) is used to implement application and session level events.
- What are the Application_Start and Session_Start subroutines used
for?
This is where you can set the specific variables for the Application
and Session objects.
- Can you explain what inheritance is and an example of when you might use
it?
When you want to inherit (use the functionality of) another class.
Example: With a base class named Employee, a Manager class could be derived from
the Employee base class.
- Whats an assembly?
Assemblies are the building blocks of the .NET
framework. Overview of assemblies from MSDN
- Describe the difference between inline and code behind.
Inline
code written along side the html in a page. Code-behind is code written in a
separate file and referenced by the .aspx page.
- Explain what a diffgram is, and a good use for one?
The DiffGram
is one of the two XML formats that you can use to render DataSet object contents
to XML. A good use is reading database data to an XML file to be sent to a Web
Service.
- Whats MSIL, and why should my developers need an appreciation of it if at
all?
MSIL is the Microsoft Intermediate Language. All .NET compatible
languages will get converted to MSIL. MSIL also allows the .NET Framework to JIT
compile the assembly on the installed computer.
- Which method do you invoke on the DataAdapter control to load your
generated dataset with data?
The Fill() method.
- Can you edit data in the Repeater control?
No, it just reads the
information from its data source.
- Which template must you provide, in order to display data in a Repeater
control?
ItemTemplate.
- How can you provide an alternating color scheme in a Repeater
control?
Use the AlternatingItemTemplate.
- What property must you set, and what method must you call in your code,
in order to bind the data from a data source to the Repeater control?
You
must set the DataSource property and call the DataBind method.
- What base class do all Web Forms inherit from?
The Page class.
- Name two properties common in every validation
control?
ControlToValidate property and Text property.
- Which property on a Combo Box do you set with a column name, prior to
setting the DataSource, to display data in the combo box?
DataTextField
property.
- Which control would you use if you needed to make sure the values in two
different controls matched?
CompareValidator control.
- How many classes can a single .NET DLL contain?
It can contain
many classes.
Web Service Questions
- What is the transport protocol you use to call a Web service?
SOAP
(Simple Object Access Protocol) is the preferred 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?
http://www.uddi.org/
- True or False: To test a Web service you must create a Windows
application or Web application to consume this service?
False, the web
service comes with a test page and it provides HTTP-GET method to
test.
State Management
Questions
- What is ViewState?
ViewState allows the state of objects
(serializable) to be stored in a hidden field on the page. ViewState is
transported to the client and back to the server, and is not stored on the
server or any other external source. ViewState is used the retain the state of
server-side objects between postabacks.
- What is the lifespan for items stored in ViewState?
Item stored in
ViewState exist for the life of the current page. This includes postbacks (to
the same page).
- What does the "EnableViewState" property do? Why would I want it on or
off?
It allows the page to save the users input on a form across
postbacks. It saves the server-side values for a given control into ViewState,
which is stored as a hidden value on the page before sending the page to the
clients browser. When the page is posted back to the server the server control
is recreated with the state stored in viewstate.
- What are the different types of Session state management options
available with ASP.NET?
ASP.NET provides In-Process and Out-of-Process
state management. In-Process stores the session in memory on the web server.
This requires the a "sticky-server" (or no load-balancing) so that the user is
always reconnected to the same web server. Out-of-Process Session state
management stores data in an external data source. The external data source may
be either a SQL Server or a State Server service. Out-of-Process state
management requires that all objects stored in session are serializable.
Edited by mrweb - 21/Apr/2009 at 7:03am
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