AJAX Client Side Event Life Cycle

1. Page Request

2. Init

3. Load

· initializeRequest

· beignRequest

· pageLoading

· pageLoaded

4. Load

· endRequest

5. unLoad

Interview Question links :

How to customize exception behavior when UpdatePanel throws an error ?

Customize exception behavior when UpdatePanel throws an error :

Set AllowCustomErrorsRedirect = false on ScriptManager control to disable Custom Errors redirection.
Handle OnAsyncPostBackError event on ScriptManager control to change script error message and perform other tasks required on error.

What does UpdateMode =Always mean in UpdatePanel control ?

UpdateMode=Always in UpdatePanel control means all contents of updatepanel is refreshed on all kinds of page postback i.e. Control in any other update panel is postedback or control in page outside updatepanel is postedback

What is default value of UpdateMode property of ASP.NET UpdatePanel control

What is default value of UpdateMode property of ASP.NET UpdatePanel control ?

Default value of UpdateMode property of ASP.NET UpdatePanel control is Always

What are values of UpdateMode property of ASP.NET UpdatePanel control ?

There are two values of UpdateMode property of ASP.NET UpdatePanel control :

Always
Conditional

What is ASP.NET UpdatePanel control?

ASP.NET UpdatePanel control enables sections of a page to be partially rendered without a postback.

What is partial page update or refresh ?

Refresh selected parts of the page without postback instead of refreshing the whole page with a postback.

How to identify which control caused asynchronous postback ?

One can use AsyncPostBackSourceElementID property of Script Manager. AsyncPostBackSourceElementID gives the ID of the control that caused the asynchronous postback.

How to identify Async Postback in Page Load event ?

Async Postback is identified using IsInAsyncPostBack property of Script Manger i.e. ScriptManager.IsInAsyncPostBack

What is ScriptManager ?

ScriptManager

ScriptManager control on a page is used to enable the Microsoft Ajax features of ASP.NET:

Client-script functionality of the Microsoft Ajax Library,
Partial-page rendering, which enables portions of page to be independently refreshed without a postback. UpdatePanel, UpdateProgress, and Timer controls require a ScriptManager control in order to support partial-page rendering.
JavaScript proxy classes for Web services, which enable you to use client script to access Web services and specially marked methods in ASP.NET pages. It does this by exposing the Web services and page methods as strongly typed objects.
JavaScript classes to access ASP.NET authentication, profile, and roles application services.

AJAX Client Side Event Life Cycle

1. Page Request

2. Init

3. Load

· initializeRequest

· beignRequest

· pageLoading

· pageLoaded

4. Load

· endRequest

5. unLoad

Interview Question links :

Customize exception behavior when UpdatePanel throws an error :

Set AllowCustomErrorsRedirect = false on ScriptManager control to disable Custom Errors redirection.

Handle OnAsyncPostBackError event on ScriptManager control to change script error message and perform other tasks required on error.

What does UpdateMode =Always mean in UpdatePanel control ?

UpdateMode=Always in UpdatePanel control means all contents of updatepanel is refreshed on all kinds of page postback i.e. Control in any other update panel is postedback or control in page outside updatepanel is postedback

What is default value of UpdateMode property of ASP.NET UpdatePanel control ?

Default value of UpdateMode property of ASP.NET UpdatePanel control is Always

What are values of UpdateMode property of ASP.NET UpdatePanel control ?

Always

Conditional

What is ASP.NET UpdatePanel control?

ASP.NET UpdatePanel control enables sections of a page to be partially rendered without a postback.

What is partial page update or refresh ?

Refresh selected parts of the page without postback instead of refreshing the whole page with a postback.

How to identify which control caused asynchronous postback ?

One can use AsyncPostBackSourceElementID property of Script Manager. AsyncPostBackSourceElementID gives the ID of the control that caused the asynchronous postback.

How to identify Async Postback in Page Load event ?

Async Postback is identified using IsInAsyncPostBack property of Script Manger i.e. ScriptManager.IsInAsyncPostBack

ScriptManager

Client-script functionality of the Microsoft Ajax Library,

Partial-page rendering, which enables portions of page to be independently refreshed without a postback. UpdatePanel, UpdateProgress, and Timer controls require a ScriptManager control in order to support partial-page rendering.

JavaScript proxy classes for Web services, which enable you to use client script to access Web services and specially marked methods in ASP.NET pages. It does this by exposing the Web services and page methods as strongly typed objects.

JavaScript classes to access ASP.NET authentication, profile, and roles application services.