This provides a categorized .NET FAQs which are of "Difference between" kind

1. Object-Oriented Programming
Programming Concepts
.NET Framework
ADO.NET
ASP.NET
.NET Architecture and Design Patterns
XML
HTML
DHTML
XHTML
JavaScript
jQuery
LINQ
Windows Communication Foundation(WCF)
AJAX
Silverlight
Windows Presentation Foundation(WPF)
.NET Remoting
WebServices
Threading
.NET Compact Framework
Windows Workflow Foundation
Windows Forms Controls
Reports
Project Management

2. Object-Oriented Programming
1. Difference between Abstract Class and Interface
2. Difference between Shadowing and Overriding
3. Difference between Method Overriding and Method Oveloading
4. Difference between Delegates and Events
5. Difference between Structure and Class
6. Difference between System.String and System.StringBuilder Classes
7. Difference between Property and Indexer
8. Difference between Overloading and Overriding
9. Difference between Singleton and Static Class
10. Difference between Virtual and Abstract Class
11. Difference between Abstraction and Encapsulation
12. Difference between Composition and Aggregation
13. Difference between Invoke,BeginInvoke and Dynamic Invoke Methods
14. Difference between Class Inheritance and Interface Inheritance
15. Difference between Virtual and Abstract Methods
16. Difference between Sealed Class and Private Class in Inheritance
17. Difference between Class and Abstract Class
18. Difference between Association, Aggregation and Inheritance relationships
19. Difference between Protected and Protected Internal (or) Friend and Protected Friend
20. Difference between Protected, Internal and Protected Internal
21. Difference between multi-level and multiple inheritance
22. Difference between Internal and Protected
23. Difference between class and Public class
Programming Concepts
1. Difference between Boxing and Unboxing
2. Difference between Constants and Read-Only variables
3. Difference between while and for loops
4. Difference between Subprocedure and Function (or) Difference between Sub and Function
5. Difference between While loop and do... While loop
6. Difference between TypeOf() and GetType()
7. Difference between IList and IEnumerable
8. Difference between for and foreach loop
9. Difference between Int32.Parse(String) and Convert.ToInt32(String)
10. Difference between REF Parameter and OUT Parameter
11. Difference between IQueryable and IEnumerable
12. Difference between Passing Objects as Parameter and Passing by Ref
13. Difference between Checked and Unchecked Keywords
14. Difference between Value Types and Reference Types
15. Difference between C# and VB.Net
16. Difference between C++ and C#
17. Difference between Arrays in C# and Arrays in other Programming Languages
18. Difference between Method Parameters and Method Arguments
19. Difference between Implicit Conversion and Explicit Conversion
20. Difference between String Keyword and System.String Class
21. Difference between Int.Parse and Int.TryParse methods
22. Difference between Proc sent by Value and by Sub
23. Difference between IEnumerable and IEnumerator

3. 24. Difference between ArrayList and HashTable
25. Difference between Array and ArrayList
26. Difference between Const, Read-Only and Static
27. Difference between HashTable and Arrays
28. Difference between Class and Module
29. Difference between Imperative and Interrogative Code
30. Difference between // Comments, /* */ Comments and /// Comments
31. Difference between VB 6 and VB.Net
32. Difference between int and int32
33. Difference between Convert.toString() and .toString() methods
34. Difference between DiectCast and cType
35. Difference between direct type casting and using "as" keyword
36. Difference between HashTable and Dictionary
37. Difference between int32 and parse
38. Difference between function and methods
39. Difference between List<string> and ArrayList
40. Difference between while,dowhile and for loop? which loop is best
.NET Framework
1. Difference between Managed and Unmanaged Code
2. Difference between Dispose and Finalize methods
3. Difference between Namespace and Assembly
4. Difference between System Exceptions and Application Exceptions
5. Difference between DLL and EXE
6. Difference between CCW and RCW
7. Difference between Weak-named .NET Components and Strong-named .NET Components
8. Difference between CTS and CLS in ASP.Net
9. Difference between .NET Framework and COM Framework
10. Difference between Dispose and Destructor
11. Difference between the statements: Obj = null adn Obj.dispose()
12. Difference between finally and dispose methods
13. Difference between VB DLL and Assemblies in .NET
14. Difference between <connectionString> and <appSettings>
15. Difference between manifest and metadata
16. Difference between VS 2003 and VS 2003
17. Difference between STA and MTA
18. Difference between Private Assembly and Shared Assembly
19. Difference between Strong and Weak named assemblies
20. Difference between Framework 2.0 and Framework 4.0
21. Difference between .net 3.5 and 4.0
ADO.NET
1. Difference between OLEDB Provider and SqlClient
2. Difference between Clone and Copy methods of DataSet
3. Difference between DataSet and DataReader
4. Difference between Classic ADO and ADO.Net
5. Difference between Optimistic and Pessimistic Locking
6. Difference between ADO.Net DataSet and ADO RecordSet
7. Difference between ADO.Net DataSet and Entity Framework
8. Difference between ExecuteScalar(), ExecuteReader() and ExecuteNonQuery()

4. 9. Difference between OLEDB SQL Server and OLEDB Dotnet Provider
10. Difference between SqlCommand object and CommandBehaviour object
11. Difference between Typed and Untyped DataSet
12. Difference between DataView and DataTable
13. Difference between Connected and Disconnected environment
14. Difference between DataSet and DataTable
15. Difference between OLEDB Reader and DataSet
16. Difference between DataGrid, DataList and Repeater
17. Difference between DataReader and DataAdapter
18. Difference between DataList and GridView
19. Difference between DataGrid and GridView
20. Difference between DetailsView and FormView
21. Difference between GridView and ListView
ASP.NET
1. Difference between ASP and ASP.NET
2. Difference between Web User Control and Web Custom Control in ASP.NET
3. Difference between Authentication and Authorization
4. Difference between HTML and Web Server Controls
5. Difference between Label control and Literal control
6. Difference between HyperLink control and LinkButton control
7. Difference between HtmlInputCheckBox control and HtmlInputRadioButton control
8. Difference between Client-side and Server-side validations in web pages
9. Difference between Content Page and Master Page
10. Difference between Submaster Page and Top-level Master Page
11. Difference between page theme and global theme
12. Difference between default skin and named skin
13. Difference between Globalization and Localization
14. Difference between Page-level caching and Fragment caching
15. Difference between absolute time expiration and sliding-time expiration
16. Difference between file-based dependency and key-based dependency
17. Difference between Cache.Insert() and Cache.Add() methods
18. Difference between SQL Cache notification and SQL Cache invalidation
19. Difference between ASP Session and ASP.NET Session
20. Difference between Response.Write() and Response.Output.Write() methods
21. Difference between Cache object and Application object
22. Difference between Server.Transer and Response.Redirect
23. Difference between Server-side and Client-side code
24. Difference between Webfarms and Webgarden
25. Difference between Grid layout and Flow layout
26. Difference between Trace and Debug in ASP.NET
27. Difference between EVAL and BIND
28. Difference between Inline code and Code-behind code
29. Difference between global.asax and web.config
30. Difference between Caching and Application
31. Difference between Application Event and Session Event
32. Difference between Session Cookies and Persistent Cookies
33. Difference between ViewState and Hidden Fields
34. Difference between web.config and machine.conig
35. Difference between tier and layer
36. Difference between User Controls and Master Page

5. 37. Difference between Data Caching and Application-level Caching
38. Difference between Page_Load() and Pre-render event
39. Difference between ASP.NET 1.0,ASP.NET 1.1 and ASP.NET 2.0
40. Difference between http and https
41. Difference between String.Empty and ""
42. Difference between .net and php
43. Difference between asp.net ,c sharp and vb.net
44. Difference between cookie and view state
45. Difference between Page.RegisterStartupScript() and Page.RegisterClientScriptBlock()
46. Difference between URL and URI
47. Difference between Src and Code-Behind
48. Difference between Login Controls and Forms Authentication
49. Difference between PostBack and CallBack
50. Difference between ASP.NET 2.0, ASP.NET 3.0 and ASP.NET 3.5
51. Difference between ASP.NET 2.0 and ASP.NET 3.5
52. Difference between Post and Get methods
53. Difference between Windows Authentication and Forms Authentication
54. Difference between Asynchronous and Synchronous HTTP handlers
55. Difference between HTTP modules and HTTP handlers
56. Difference between themes and CSS
57. Difference between System Exceptions and Application Exceptions
58. Difference between Session.Abandon() and Session.Clear()
59. Difference between Website and Web Application Project Models
60. Difference between Div and Table
61. Difference between EnableviewState and ViewStateMode properties
.NET Architecture and Design Patterns
1. Difference between Factory and Abstract Factory patterns
2. Difference between MVP and MVC
3. Difference between MVP and MVVM pattern
4. Difference between MVC pattern / MVP pattern / MVVM pattern
5. Difference between MEF and DI IOC
6. Difference between facade and mediator
7. Difference between command, strategy and template method
8. Difference between Template and Strategy pattern
9. Difference between Static class and Singleton instance
10. Difference between Factory Pattern and Dependency Injection
11. Difference between Abstract Factory Pattern And Builder Pattern
12. Difference between Builder Pattern And Composite Pattern
13. Difference between Observer Pattern and Proxy Pattern
14. Difference between Adapater and Builder
15. Difference between Strategy and Inversion of Control (IOC)
16. Difference between Proxy and Adaptor
17. Difference between Decorator and Visitor
18. Difference between Strategy and State
19. Difference between Multi-Tier and Multi-Layer

6. XML
1. Difference between XMLDocument and XpathDocument
2. Difference between XML and XHTML
3. Difference between HTML and XML
4. Difference between XML,XSD and XSLT
5. What is the difference between XML Encoding and Binary Encoding
6. What is the main difference between the xmlserialization and soap serialization?
7. Difference between MSML and .NET Framework XML classes
8. Difference between XML files and Style Sheets
9. Difference between XML schema and DTD
10. Difference between <c> and <code> XML documentation tag
HTML
1. Difference between HTML 4 and HTML 5
2. Difference between HTML and Text
3. Difference between XML and XHTML
4. Difference between HTM and HTML
5. Difference between PHP and HTML
6. Difference between HTML 5 and Silverlight and Which one is best?
7. Difference between attribute value and property value in HTML
8. Difference between HTML and XHTML
DHTML
1. Difference between DHTML and XHTML
2. Difference between AJAX and DHTML
3. Difference between dynamic html(DHTML) and javascript
4. Difference between FontSize and Font Size in DHTML
XHTML
1. Difference between XML and XHTML
2. Difference between XHTML Strict and Transitional
3. Difference between DHTML and XHTML
JavaScript
1. Difference between JavaScript and AJAX
2. Difference between JSP and JavaScript
3. Difference between CSS and JavaScript
4. Difference between syntax of vbscript and javascript
5. Difference between javascript and jquery
6. Difference between <a href="javascript://"> and <a href="#">
7. Difference between dynamic html(DHTML) and javascript
8. Difference between calling a JavaScript function directly like onclick = "a()" and
onclick="JavaScript:a()". where, a() is a function written in JavaScript
9. Difference between close and refresh in Javascript
10. Difference between Validation controls validation and JavaScript validation
11. Difference between onsubmit and onclick

7. jQuery
1. Difference between JQuery and JQuery UI
2. Difference between javascript and jquery
3. Difference between dataTable and datagrid view in jquery
4. Difference between jQuery find and children methods
5. Difference between js and jquery
6. Difference between window.load & document.ready in jQuery
7. Difference between body.onload() and document.ready() functions
8. Difference between .live() and .bind() in jQuery
LINQ
1. Difference between Nhibernate and Linq
2. Difference between linq and entity Framework
3. Difference between ApplicatoinBlocks and Linq
4. Difference between linq to sql and ado.net 2? Which one them is better?
5. Difference between linq to sql and Entity Framework(EF)
6. Difference between LINQ and Lambda Expression
7. Differences between using LINQ to SQL and LINQ to Entites
8. Difference between Lambda expression and Action
9. Difference between Take and Skip clauses
10. Difference between Select clause and SelectMany() method in LINQ
11. Difference between LINQ and Stored Procedures
Windows Communication Foundation(WCF)
1. Difference between a WCF call and a regular method call
2. Difference between wcf 3.0 and wcf 3.5
3. Difference between WCF Service Application & Website WCF Service
4. Difference between Message and Transport level security in WCF
5. Difference between Communication exception and Fault exception in WCF
6. Difference between a client and a service in WCF Context
7. Difference between Serialization and Encoding in WCF
8. Difference between Web Services, WCF and WPF
9. Difference between WCF and Web Services
10. Difference between WPF and WCF
11. Difference between Buffered transfer and Streamed transfer in WCF
12. Difference between basicHttpBinding and wsHttpBinding
13. Difference between IIS hosting and Self hosting in WCF
14. Difference between Service and Component
15. Difference between Service Contract and Data Contract
16. Difference between Service level message and Transport level message
AJAX
1. Difference between JavaScript and AJAX
2. Difference between AJAX and DHTML
3. Difference between proxied and proxyless calls in AJAX
4. Difference between Rating and RatingExtender control in ajax control toolkit
5. Difference between Synchronous Postback and Asynchronous Postback

8. Silverlight
1. Difference between Silverlight and ASP.NET
2. Difference between HTML 5 and Silverlight and Which one is best?
3. Difference between Name and X:Name in silverlight
4. Difference between wpf and silverlight
5. Difference between Silverlight applications and XBAP applications in WPF
Windows Presentation Foundation(WPF)
1. Difference between wpf and silverlight
2. Difference between Web Services, WCF and WPF
3. Difference between wpf and silverlight
4. Difference between a normal non-WPF application and a WPF application
5. Difference between WPF and WCF
6. Difference between Bubbling and Tunneling events
7. Difference between Simple controls and Content controls
.NET Remoting
1. Difference between Marshal by value and Marshal by ref in .net remoting
2. Difference between remotable and non-remotable objects
3. Difference between singleton mode and singlecall mode
4. Difference between HTTP and IPC Channels
5. Difference between transparent proxies and real proxies
6. Difference between Web Services and Remoting
7. Difference between RegisterWellKnownType() and RegisterWellKnownClientType()
methods in .NET remoting
8. Difference between Binary Serialization and XML Serialization
WebServices
1. Difference between IIS and Webservices
2. Difference between Transport layer security and message security in webservice
3. Difference between wcf an webservice
4. Difference between Windows Services and Web Services
5. Difference between Web Services, WCF and WPF
6. Difference between svc and asmx
7. Difference between Services and Web Services
8. Difference between SOAP and REST Webservice type
Threading
1. Difference between lock and monitor in c#.net
2. Difference between thread and process
3. Difference between mutex and semaphore
4. Difference between UI thread and Background thread
.NET Compact Framework
1. Difference between Pocket PC and Smartphone

9. Windows Workflow Foundation
1. Difference between system workflow and human workflow
2. Difference between Sequential and State Machine workflows
Reports
1. Difference between Private and Shared data sources
2. Difference between Crystal and SQL Reporting Services
Project Management
1. Difference between SITP and UTP in testing
2. Difference between Black-Box testing and White-Box testing
3. Difference between Unit testing, Assembly testing and Regression testing
4. Difference between Manager and Leader
Windows Forms Controls
1. Difference between anchoring and docking
2. Difference between Add() and Insert() methods of a ListBox control
3. Difference between MDI form and Standard form
4. Difference between MenuStrip control and ContextMenuStrip control
5. Difference between toolstrip drop-down button and toolstrip split button
6. Difference between CheckBox control and RadioButton control
7. Difference between ListBox control and ComboBox control
8. Difference between Panel and GroupBox control
9. Difference between WindowsDefaultLocation and WindowsDefaultBounds
10. Difference between pixels, points, em's and fonts
11. Difference between Read() and ReadLine() methods
12. Difference between Write() and WriteLine() methods
13. Difference between Windows application and Windows service
14. Difference between an input box and message box
15. Difference between Windows and Console application