Tuesday, 18 October 2011

Debugging and Testing Questions Part 3

What is view state and use of it?
The current property settings of an ASP.NET page and those of any ASP.NET
server controls contained within the page. ASP.NET can detect when a form
is requested for the first time versus when the form is posted (sent to the
server), which allows you to program accordingly.

What are user controls and custom controls?
Custom controls:
A control authored by a user or a third-party software vendor that does not
belong to the .NET Framework class library. This is a generic term that
includes user controls. A custom server control is used in Web Forms
(ASP.NET pages). A custom client control is used in Windows Forms
User Controls:
In ASP.NET: A user-authored server control that enables an ASP.NET page to
be re-used as a server control. An ASP.NET user control is authored
declaratively and persisted as a text file with an .ascx extension. The
ASP.NET page framework compiles a user control on the fly to a class that
derives from the System.Web.UI.UserControl class.

What are the validation controls?
A set of server controls included with ASP.NET that test user input in HTML
and Web server controls for programmer-defined requirements. Validation
controls perform input checking in server code. If the user is working with a
browser that supports DHTML, the validation controls can also perform
validation using client script.

What's the difference between Response.Write() andResponse.Output.Write()?
The latter one allows you to write formattedoutput.

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.

Where does the Web page belong in the .NET Framework class hierarchy?

Where do you store the information about the user's locale?
What's the difference between Codebehind="MyCode.aspx.cs" and
CodeBehind is relevant to Visual Studio.NET only.

What's a bubbled event?
When you have a complex control, likeDataGrid, 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 over a
certain button.

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