(B) What’ is the sequence in which ASP.NET events are processed?
Following is the sequence in which the events occur:-
• Page_Init.
• Page Load.
• Control events
• Page- Unload event.
• Page_Init.
• Page Load.
• Control events
• Page- Unload event.
Page_init event only occurs when first time the page is started, but Page Load occurs in subsequent request of the page.
(B) In which event are the controls fully loaded?
Page load event guarantees that all controls are fully loaded. Controls are also accessed in Page_Init events but you will see that view state is not fully loaded during this event.5(B) How can we identify that the Page is Post Back?
Page object has an “IsPostBack” property, which can be checked to know that is the page posted back.
(A) What is event bubbling?
Server controls like Data grid, Data List, and Repeater can have other child controls inside them. Example Data Grid can have combo box inside data grid. These child control do not raise there events by themselves, rather they pass the event to the container parent (which can be a data grid, data list, repeater), which passed to the page as “ItemCommand” event. As the child control send events to parent it is termed as event bubbling.(B) How do we assign page specific attributes?
Page attributes are specified using the @Page directive.(A) How do we ensure view state is not tampered?
Using the @Page directive and setting ‘EnableViewStateMac’ property to True.(B) What is the use of @ Register directives?
@Register directive informs the compiler of any custom server control added to the page.(B) What is the use of Smart Navigation property?
It’s a feature provided by ASP. NET to prevent flickering and redrawing when the page is posted back.(B) What is AppSetting Section in “Web.Config” file?
Web.config file defines configuration for a web project. Using “AppSetting” section, we can define user-defined values. Example below defined is “Connection String” section, which will be used through out the project for database connection.(B) How can we create custom controls in ASP.NET?
User controls are created using .ASCX in ASP.NET. After .ASCX file is created you need to two things in order that the ASCX can be used in project:.• Register the ASCX control in page using the
<%@ Register tag prefix="Accounting" Tag name="footer" Src="Footer.ascx" %>
• Now to use the above accounting footer in page you can use the below directive.
(B) How many types of validation controls are provided by ASP.NET?
There are six main types of validation controls:-RequiredFieldValidator
It checks whether the control have any value. It is used when you want the control should not be empty.
RangeValidator
It checks if the value in validated control is in that specific range. Example TxtCustomerCode should not be more than eight lengths.
CompareValidator
It checks that the value in controls should match some specific value. Example Textbox TxtPie should be equal to 3.14.
RegularExpressionValidator
When we want the control, value should match with a specific regular expression.
CustomValidator:It is used to define User Defined validation.
Validation Summary
It displays summary of all current validation errors on an ASP.NET page.
