ASP .NET Interview Questions and Answers

41. What are the events that happen when a client requests an ASP.NET page from IIS server?

The following events happen when a client requests an ASP.NET page from the IIS server:

  1. User requests for an application resource.
  2. The integrated request-processing pipeline receives the first user request.
  3. Response objects are created for each user request.
  4. An object of the HttpApplication class is created and allocated to the Request object.
  5. The HttpApplication class processes the user request.

42. Explain file-based dependency and key-based dependency.

In file-based dependency, you have to depend on a file that is saved in a disk. In key-based dependency, you have to depend on another cached item.

43. How can you implement the postback property of an ASP.NET control?

You need to set the AutoPostBack property to True to implement the PostBack property of controls.

44. Explain how Cookies work. Give an example of Cookie abuse.

The server tells the browser to put some files in a cookie, and the client then sends all the cookies for the domain in each request. An example of cookie abuse is large cookies affecting the network traffic.

45. Explain login controls.

Login controls are built-in controls in ASP.Net for providing a login solution to ASP.NET application. The login controls use the membership system to authenticate a user credentials for a Web site.

There are many controls in login controls.

  • ChangePassword control – Allows users to change their password.
  • CreateUserWizard control – Provides an interface to the user to register for that Web site.
  • Login control – Provides an interface for user authentication. It consists of a set of controls, such asTextBox, Label, Button, CheckBox, HyperLink.
  • LoginView control – Displays appropriate information to different users according to the user’s status.
  • LoginStatus control – Shows a login link to users, who are not authenticated and logout link, who are authenticated
  • LoginName control – Displays a user name, if the user logs in.
  • PasswordRecovery control – Allows users to get back the password through an e-mail, if they forget.

46. What is the use of PlaceHolder control? Can we see it at runtime?

The PlaceHolder control acts as a container for those controls that are dynamically generated at runtime. We cannot see it at runtime because it does not produce any visible output. It used only as a container.

47. What setting must be added in the configuration file to deny a particular user from accessing the secured resources?

To deny a particular user form accessing the secured resources, the web.config file must contain the following code:

<authorization >
<deny users=”username” />
</authorization>

48. What are the event handlers that can be included in the Global.asax file?

The Global.asax file contains some of the following important event handlers:

  • Application_Error
  • Application_Start
  • Application_End
  • Session_Start
  • Session_End

49. What is the difference between page-level caching and fragment caching?

In the page-level caching, an entire Web page is cached; whereas, in the fragment caching, a part of the Web page, such as a user control added to the Web page, is cached.

50. Make a list of all templates of the Repeater control.

The Repeater control contains the following templates:

  • ItemTemplate
  • AlternatingltemTemplate
  • SeparatorTemplate
  • HeaderTemplate
  • FooterTemplate

51. Describe the complete lifecycle of a Web page.

When we execute a Web page, it passes from the following stages, which are collectively known as Web page lifecycle:

  • Page request – During this stage, ASP.NET makes sure the page either parsed or compiled and a cached version of the page can be sent in response
  • Start – During this stage sets the Request and Response page properties and the page check the page request is either a postback or a new request
  • Page Initialization – During this stage, the page initialize and the control’s Unique Id property are set
  • Load – During this stage, if the request is postback, the control properties are loaded without loading the view state and control state otherwise loads the view state
  • Validation – During this stage, the controls are validated
  • Postback event handling – During this stage, if the request is a postback, handles the event
  • Rendering – During this stage, the page invokes the Render method to each control for return the output
  • Unload – During this stage, when the page is completely rendered and sent to the client, the page is unloaded.

52. How can you assign page specific attributes in an ASP.NET application?

The @Page directive is responsible for this.

53. Which method is used to post a Web page to another Web page?

The Respose.Redirect method is used to post a page to another page, as shown in the following code snippet:Response.Redirect(“DestinationPageName.aspx”);

54. What is a Cookie? Where is it used in ASP.NET?

Cookie is a lightweight executable program, which the server posts to client machines. Cookies store the identity of a user at the first visit of the Web site and validate them later on the next visits for their authenticity. The values of a cookie can be transferred between the user’s request and the server’s response.

55. What are Custom User Controls in ASP.NET?

The custom user controls are the controls that are defined by developers. These controls are a mixture of custom behavior and predefined behavior. These controls work similar to other Web server controls.

56. What does the .WebPart file do?

The .WebPart file explains the settings of a Web Parts control that can be included to a specified zone on a Web page.

57. How can you enable impersonation in the web.config file?

To enable impersonation in the web.confing file, you need to include the <identity> element in the web.configfile and set the impersonate attribute to true as shown in the following code snippet:
<identity impersonate = “true” />

58. How can you identify that the page is PostBack?

The Page object uses the IsPostBack property to check whether the page is posted back or not. If the page is postback, this property is set to true.

59. In which database is the information, such as membership, role management, profile, and Web parts personalization, stored?

The aspnetdb database stores all information.

60. What is State Management? How many ways are there to maintain a state in .NET?

State management is used to store information requests. The state management is used to trace the information or data that affect the state of the applications.

There are two ways to maintain a state in .NET, Client-Based state management and Server-Based state management.

The following techniques can be used to implement the Client-Based state management:

  • View State
  • Hidden Fields
  • Cookies
  • Query Strings
  • Control State

The following techniques can be used to implement Server-Based state management:

  • Application State
  • Session State
  • Profile Properties

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