ASP.NET

1. ASP.NET Introduction 2. Comp of .Net Framework 3.5 3. Sys.Req for VS 2008 4. ASP.NET Envrmnt Setup 5. VS2010 Ultimate Sys.Req 6. Installing VS 2010 7. VS 2012 Sys.Req 8. Installing VS Exp 2012 9. Start the VS 2008 10. Application Life Cycle 11. Page Life Cycle 12. Page Life Cycle Events 13. ASP.NET Example 14. Event Handling 15. Default Events 16. Server Side 17. Request Object 18. Response Object 19. Server Controls 20. Server Controls Properties 21. Server Controls Methods 22. HTML Server Controls 23. Client Side 24. ASP.NET Basic Controls 25. TextBox Control 26. CheckBox Controls 27. RadioButton Controls 28. ListBox Control 29. HyperLink Control 30. Image Control 31. BulletedList Control 32. ASP.NET Directives 33. Implements Directive 34. Master Type Directive 35. Page Directive 36. PreviousPage Type 37. Managing State 38. Control State 39. Cookies 40. Query Strings 41. Server-Side State 42. Session State 43. Validation Controls 44. Required FieldValidator 45. Range Validator 46. Compare Validator 47. RegularExpressionValidator 48. Custom Validator 49. Validation Summary 50. Data Source Control 51. AdRotator Control 52. Calendar Control 53. Calendar Control Example 54. Panel Control 55. Panel Control Example 56. Multi Views Control 57. MultiView & View controls 58. MultiView Control Example 59. FileUpload Control 60. FileUpload Control Eg 61. AJAX Control 62. UpdatePanel control 63. UpdateProgress Control 64. Custom Controls 65. Custom Control Eg 66. Personalization 67. Create Simple Profile 68. ADO.NET 69. ADO.NET Objects 70. DataTable 71. DataRow 72. DataColumn 73. Object Example 74. Error Handling 75. Tracing Errors 76. Debugger 77. Security 78. Authentication 79. Authorization 80. LINQ 81. LINQ Query Operators 82. LINQ Example 83. Caching 84. Data Caching 85. Output Caching 86. Object Caching 87. Web Services 88. Create Web Services Eg 89. Web & Machine.config 90. Settings Schema 91. ASP.NET Deployment 92. XCopy Deployment 93. Web Setup Project 94. ASP Interview Part 1 95. ASP Interview Part 2 96. ASP Interview Part 3 97. ASP Interview Part 4 98. ASP Interview Part 5 99. ASP Interview Part 6
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ASP.Net Interview Questions and Answers Part 4

31. What are the Advantages & Disadvantages of Cookies?

Advantages:

  • Configurable expiration rules: The cookie can expire when the browser session ends, or it can exist indefinitely on the client computer, subject to the expiration rules on the client.

  • No server resources are required: The cookie is stored on the client and read by the server after a post.

  • Simplicity: The cookie is a lightweight, text-based structure with simple key-value pairs.

  • Data persistence: Although the durability of the cookie on a client computer is subject to cookie expiration processes on the client and user intervention, cookies are generally the most durable form of data persistence on the client.

 

Disadvantages:

  • Size limitations: Most browsers place a 4096-byte limit on the size of a cookie, although support for 8192-byte cookies is becoming more common in newer browser and client-device versions.

  • User-configured refusal: Some users disable their browser or client device's ability to receive cookies, thereby limiting this functionality.

  • Potential security risks: Cookies are subject to tampering. Users can manipulate cookies on their computer, which can potentially cause a security risk or cause the application that is dependent on the cookie to fail.

 

32. How many types of Cookies are available in ASP.NET?

  • There are two types of Cookies available in ASP.NET:

  • Session Cookie - Resides on the client machine for a single session until the user does not log out.

  • Persistent Cookie - Resides on a user's machine for a period specified for its expiry, such as 10 days, one month, and never.

  • The user can set this period manually.

 

33. What is Query String?

  • Query strings are usually used to send information from one page to another page. They are passed along with URL in clear text.

  • Most browsers impose a limit of 255 characters on URL length.

  • We can only pass smaller amounts of data using query strings. Since Query strings are sent in clear text, we can also encrypt query values. Also, keep in mind that characters that are not valid in a URL must be encoded using Server.UrlEncode.

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34. What are the advantages & disadvantages of Query String?

Advantages:

  • No server resources are required: The query string is contained in the HTTP request for a specific URL.

  • Widespread support: Almost all browsers and client devices support using query strings to pass values.

  • Simple implementation: ASP.NET provides full support for the query-string method, including methods of reading query strings using the Params property of the HttpRequest object.

 

Disadvantages:

  • Potential security risks: The information in the query string is directly visible to the user via the browser's user interface. A user can bookmark the URL or send the URL to other users, thereby passing the information in the query string along with it. If you are concerned about any sensitive data in the query string, consider using hidden fields in a form that uses POST instead of using query strings.

  • Limited capacity: Some browsers and client devices impose a 2083-character limit on the length of URLs.

 

35. Which ASP.NET objects encapsulate the state of the client and the browser?

  • The Session object encapsulates the state of the client and browser.

 

36. What is Server-side state management?

  • Server-side options for storing page information typically have higher security than client-side options, but they can use more Web server resources, which can lead to scalability issues when the size of the information store is large. ASP.NET provides several options to implement server-side state management. 

  • The following are the server-side state management that ASP.NET supports:

Application State

Session State

 

37. What is Application State?

  • Application state is used to store data which is visible across entire application and shared across multiple user sessions. Data which needs to be persisted for entire life of application should be stored in application object.

  • In classic ASP, application state is used to store connection strings. It's a great place to store data which changes infrequently. We should write to application variable only in application_Onstart event (global.asax) or application.lock event to avoid data conflicts.

 

38. What are the advantages & disadvantages of Application state?

Advantages:

  • Simple implementation: Application state is easy to use, familiar to ASP developers, and consistent with other .NET Framework classes.

  • Application scope: Because application state is accessible to all pages in an application, storing information in application state can mean keeping only a single copy of the information (for instance, as opposed to keeping copies of information in session state or in individual pages).

 

Disadvantages:

  • The scope of application state can also be a disadvantage. Variables stored in application state are global only to the particular process the application is running in, and each application process can have different values. Therefore, you cannot rely on application state to store unique values or update global counters in Web-garden and Web-farm server configurations.

  • Limited durability of data: Because global data that is stored in application state is volatile, it will be lost if the Web server process containing it is destroyed, such as from a server crash, upgrade, or shutdown.

  • Resource requirements: Application state requires server memory, which can affect the performance of the server as well as the scalability of the application.

 

39. What is Session state?

  • ASP.NET provides a session state, which is available as the HttpSessionStateclass, as a method of storing session-specific information that is visible only within the session. ASP.NET session state identifies requests from the same browser during a limited time window as a session, and provides the ability to persist variable values for the duration of that session.

  • You can store your session-specific values and objects in session state, which is then managed by the server and available to the browser or client device. The ideal data to store in session-state variables is short-lived, sensitive data that is specific to an individual session.

 

40. What are the advantages of using session state?

  • Stores client data separately.

  • Data persistence   Data placed in session-state variables can be preserved through Internet Information Services (IIS) restarts and worker-process restarts without losing session data because the data is stored in another process space. Additionally, session-state data can be persisted across multiple processes, such as in a Web farm or a Web garden.

  • Platform scalability   Session state can be used in both multi-computer and multi-process configurations, therefore optimizing scalability scenarios.

  • Simple implementation   The session-state facility is easy to use, familiar to ASP developers, and consistent with other .NET Framework classes.

  • Extensibility   You can customize and extend session state by writing your own session-state provider. Session state data can then be stored in a custom data format in a variety of data storage mechanisms, such as a database, an XML file, or even to a Web service. Session-specific events   Session management events can be raised and used by your application.

 

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