A.
Server controls like Datagrid, DataList, Repeater can have
other child controls inside
them. Example
DataGrid can have combo box inside datagrid. These child control do not
raise there events
by themselves, rather they pass the event to the container parent (which
can be a datagrid,
datalist, repeater), which passed to the page as “ItemCommand” event.
As the child control
send there events to parent this is termed as event bubbling.
2.What is AppSetting Section in “Web.Config” file ?
A.
Web.config file defines configuration for a webproject.
Using “AppSetting” section we
can define user
defined values.
Example below
defined is “ConnectionString” section
which will be used
through out the project for database connection.
<configuration>
<appSettings>
<add
key="ConnectionString"
value="server=xyz;pwd=www;database=testing" />
</appSettings>
3.What’s the use of SmartNavigation property ?
A.
It’s a feature provided by ASP.NET to prevent flickering
and redrawing when the page is
posted back.
Note:- This is only
supported for IE browser. Project’s who have browser compatibility as
requirements have to
think some other ways of avoiding flickering.
4.How can you enable automatic paging in DataGrid ?
A.
Following are the points to be done in order to enable
paging in Datagrid :-
v Set the
“AllowPaging” to true.
v In
PageIndexChanged event set the current pageindex clicked.
Note:- The answers
are very short, if you have implemented practically its just a revision.
If you are fresher
just make sample code using Datagrid and try to implement this
functionality.
5.What’s difference between Datagrid, Datalist and repeater?
A.
Datagrid, Datalist and Repeater are all ASP.NET data Web
controls.
They have many
things in common like DataSource Property, DataBind Method
ItemDataBound and
ItemCreated.
When you assign the
DataSource Property of a Datagrid to a DataSet then each DataRow
present in the
DataRow Collection of DataTable is assigned to a corresponding
DataGridItem and
this is same for the rest of the two controls also. But The HTML code
generated for a
Datagrid has an HTML TABLE <ROW> element created for the particular
DataRow and its a
Table form representation with Columns and Rows.
For a Datalist its
an Array of Rows and based on the Template Selected and the
RepeatColumn
Property value We can specify how many DataSource records should
appear per HTML <table>
row. In short in datagrid we have one record per row, but in
datalist we can have
five or six rows per row.
For a Repeater
Control, the Datarecords to be displayed depends upon the Templates
specified and the
only HTML generated is the due to the Templates.
In addition to
these, Datagrid has a in-built support for Sort, Filter and paging the Data,
which is not
possible when using a DataList and for a Repeater Control we would require
to write an explicit
code to do paging.
6.What is the difference between eval and bind?
A.
1.The Eval method evaluates late-bound data expressions in
the templates of data-bound controls
such as the
GridView, DetailsView, and FormView controls and the Bind method is typically
used
with input controls
such as the TextBox control rendered by a GridView row in edit mode.
2.Eval is a
protected method defined on the TemplateControl class, from which the Page
class is derived.
Bind is a new
ASP.NET 2.0 databinding keyword. It's not a method of any specific class.
3.Bind() is used to
two-way databinding. So when used with the proper type of datasource,
it will pull the
altered values out of the GridView or other control and save them back to the
database.
Eval() is a
one-way, "read only" way to bind the values.
7.A data-bound control connects to a data source control
through its ___________ property?
A.
DataSourceID
8.What are the best practices to follow to secure connection
strings in an ASP.NET web application?
A.
1. Always store connection strings in the site's
Web.config file. Web.config is very secure.
Users will not be
able to access web.config from the browser.
2. Do not store
connection strings as plain text. To help keep the connection to your database
server secure,
it is recommended
that you encrypt connection string information in the configuration file.
3. Never store
connection strings in an aspx page.
4. Never set
connection strings as declarative properties of the SqlDataSource control or
other data source controls.
9.A _____________ control bind to a data source control and
automatically fetch data at the appropriate time in the page request
lifecycle.
A.
DataBound control.
10.______________ Controls enable rich capabilities for
retrieving and modifying data, including querying, sorting, paging, filtering, updating,
deleting, and inserting.
A.
DataSource control.
11.what is expression Builder? Why would you use it?
A.
ASP.NET 2.0 introduces a declarative new syntax for
referencing code to substitute values into the page,
called Expression
Builders. ASP.NET 2.0 includes expression builders for referencing string
resources
for localization,
connection strings, application settings, and profile values. You can also write
your own
expression builders
to create your own custom syntax to substitute values in a page rendering.
12.what is simple Data bound control and Composite data
bound control?
A.
Composite Data Controls
1.Composite data
controls are not directly transformed to a single HTML element
Consist of different
templates which is used to define layout and style flexibly
2.More data fields
can be bound to controls
3.Support
bi-directional data binding.
Simple Data controls
1.It takes only 2
fields.1.display value.2.display field.
And takes only one
value.
2.only 2 fields are
bound to controls.
3.support uni
directional data binding.
13.What is AdRotator control?
A.
The AdRotator control is used to display a sequence of ad
images.
This control uses an
XML file to store the ad information. The XML file must begin and end with an
<Advertisements> tag.
Inside the
<Advertisements> tag there may be several <Ad> tags which defines
each ad.
14.what is an item template?
A.
ItemTemplate: ItemTemplate defines how the each item is
rendered from data source collection.
15.what is an AlternatingItemTemplate?
A.
AlternatingItemTemplates is used to change the background
color and styles of AlternatingItems in DataSource collection
16.what is an HeaderTemplate?
A.
HeaderTemplate is used to display Header text for
DataSource collection and apply different styles for header text.
17.what is an FooterTemplate?
A.
FooterTemplate is used to display footer element for DataSource
collection
18.what is an SeparatorTemplate?
A.
The <SeparatorTemplate> element can be used to
describe a separator between each record
19.what is an repeater?
A.
The Repeater control is used to display a repeated list of
items that are bound to the control.
The Repeater control
may be bound to a database table, an XML file, or another list of items.
20. What is the Differene between RowUpdating Event and RowUpdated
Event?
The RowUpdated event is raised when a row's Update button
is clicked,
but after the GridView control updates the row.
The RowUpdating event is raised when a row's Update button
is clicked,
but before the GridView control updates the row.
21. What is Cascading in DataBound controls?
A.
Cascading in DataBound Controls Refer to the behaviour of
a control in occardance
with the other i.e Data of one control is filtered by the
other control.
Here Simple data binding plays a very improtant role as they
have DisplayField and the ValueField.
22. What are the DataBound Controls that support Insertion?
Not all DataBound Controls support insertion in order to
achive this, the controls should
support 2 way binding so as to perform insertion into the
DataSource. Here 2 way binding refers
to Extracting and Inserting the data from and into the
DataSource.
below are the list of such controls.
(i) FormsView
(ii) DetailsView
(iii)DataListView
Above controls support Grouping,Paging,Inserting,Editing and
Deleting of the
data from the DataSource binded to them.
23. how can we find the value of the control present inside
the gridView cell?
A. To find the value of the Control we have to follow two
steps
1.
Identify the cell position in the grid
2. use
the FindControl() method over in the cell position.
24. What is RowDataBound Event? Explain?
RowDataBound is and event of GridView Control that fires
when the gridView is binding
with the data. informally, while loading the data into the
gridView this event fires.
25. Can we have a DataBound Control within any another?
Explain?
Yes, DataBound Controls can also act as container
controls and they can be nested with each other.
a DataBound control that is inside the other becomes a child
control, and the control containing it
becomes the parent control.
26. What is DataFormatString Property and List few
DataFormatString?
A.
DataFormatString is a Propery of a BoundField.
it Customizes the input data as per the user Requirment.
Example:
DataFormatString = "{0:D}"
This will give the out put in long date format.
27.What is RepeatLayout, RepeatColumn, RepeatDirection in
DataList?
A.
RepeatLayout: The layout that the datalist view should use
to repeat items.
RepeatDirection: The Direction to Repeat the items.
RepeatColumn: used to specify number of columns required in
datalist to repeat items.
28. What is ItemCommand? Explain?
ItemCommand is an Event of DataBound control which is fired when a user Click on any button.
Also read More DataGrid Questions and Answers
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