What are the differencec between Web Services and WCF ?

Sno	WebServices	WCF
1	Can send/receive messages using SOAP over HTTP	Can send/receive using SOAP and any transport protocol like HTTP, TCP, named pipes, and Microsoft Message Queuing (MSMQ), etc.
2	Can only be hosted in IIS and the security is limited.	Can be hosted in IIS, self-host servers with console applications or Win NT services or any other server.
3	Doesnt support	supports binary .NET – .NET communications, distributed transactions, WS-* specifications, queued messaging and Restful communications.
4	Simple when compared to WCF	Little more work is needed

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What is the difference between Convert.ToInt32(string) and Int32.Parse(string) ?

Int32.Parse thorws an exception when null value is passed whereas Convert.ToInt32 returns zero . Apart from this both function in a simillar manner.

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What is the difference between EVAL and BIND ?

Eval is readonly and used to display whereas Bind is used to both display and update .

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What are the differences between DataReader and DataAdapter ?

Sno	DataReader	DataAdapter
1	Works in Connected Mode	Works in Disconnected Mode
2	Can have only one record at a time	Can have more than 1 records.
3	Is ForwardOnly and Readonly	Can navigate front and back and editable
4	Faster	Slower

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What are the Differences between Response.Expires and Expires.Absolute ?

Expires:
The Expires property specifies the duration of time before a page that is cached on a browser expires.
ExpiresAbsolute:
The ExpiresAbsolute property specifies the date and time at which a page cached on a browser expires.

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What is the main difference between MVP and MVC ?

In MVP the view is completely controlled by the Presenter, whereas in MVC, the controller and the model can update the view.

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Name some of the popular Web Presentation Patterns?

1. MVC (Mode View Controller)
2. Page Controller Pattern
3. Front Controller Pattern

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What are the Differences between TRUNCATE and Delete ?

Sno	TRUNCATE	DELETE
1	TRUNCATE is faster	Comparitively slower.
2	Removes all rows from a table	Can remove specific rows with Where clause
3	Can not be Rolled back.	Can be.
4	Is DDL Command.	Is DML Command.
5	Resets identity of the table.	Does not.
6	Removes the data by deallocating the data pages and logs the deallocation.	Removes one row at a time and records an entry in the transaction log for each deleted row.

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What are the differences between Primarykey and Unique key?

Sno	Primarykey	Unique key
1	Creates Clustered index.	Creates Non-Clustered index.
2	Null values are not allowed	Allows.

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What are the differences between Inline code and Code Behind Code?

Sno	Inline code	Code Behind Code
1	Its within .aspx file.	Its in a external class file.
2	Dynamically compiled.	Compiled prior to deployment and linked with .aspx file.

What are the differences between TypeOf() and GetType() ?

Sno	TypeOf()	GetType()
1	Its an operator.	Its a method.
2	Can't be overloaded	Has lot of overloads.

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What are the differences between Dll and Exe ?

Sno	Dll	Exe
1	Objects of DLLs can be created	Cant
2	In-Process	Out-Process
3	Cant be started as a standalone.	Can be.

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What area the differences between Global.asax and Web.Config?

Sno	global.asax	web.config
1	Class File	Its an XML file
2	There can be only one for an application	there can be many if under different sub-folders
3	Can have Application and Session events	Can't
4	Need to be recompiled when changes are made	No need to compile when changes are made.

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What are the differences between const and readonly ?

Sno	const	readonly
1	Can't be static.	Can be instance level or static
2	evaluated at design time	evaluated at run time
3	Initialized at declaration	Initialized at declaration and in constructor
4	must be of integral type or enumeration	In addition it can have complex types with new keyword and enumerations are not allowed

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what are the Differences between Abstract Class and Interface ?

Sno	Abstract Class	Interface
1	Can have implemented Methods	Cant
2	A class can inherit only one abstract class	A Class can implement any number of Interfaces.
3	We go for Abstract classes on such situations where we need to give common functionality for group of related classes	We go for Interface on such situations where we need to give common functionality for group of un-related classes
4	If you add a new method, then you can provide a default implementation and so no need to make any change to existing work.	If you add a new method, then you need to change all the existing work.
5	Static and Instance constants are possible.	Only Static  constants are possible.

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What are the Differences between Server.Transfer and Response.Redirect ?

Difference between Server.Transfer and Response.Redirect

Sno	Server.Transfer	Response.Redirect
1	The navigation happens on the server-side ,so client history is not updated	The navigation happens on the client-side ,so client history is  updated
2	Data can be persist accros the pages using Context.Item collection	Context.Items loses the persisitance.
3	No Round-trips	Makes a Round-trip
4	Has Good encapsulation	No

What is an Index and its Types and Differences between them ?

What is an Index?

Indexing is a mechanism which makes record
fetching faster. It does this by having pre-sorted the rows of the table.

Types of Indexes:

1. 
   
   Clustered.
   
   
2. 
   
   Non-Clustered.

Sno	Clustered	Non - Clustered
1	It reorders the physical storage of records in the table.	It sorts and maintain a separate storage.
2	There can be only one Clustered index per table.	More than one.
3	The leaf nodes contain data	The leaf node contains pointer to data

Differences between Dataset and DataReader

Sno	Dataset	DataReader
1	Disconnected Mode	Connected Mode
2	Can navigate back and forth	Can navigate forward only
3	Data is editable	Data is Readonly
4	Can contain more than one table and relationships	Can contain only one row at a time.
5	Slower as having more overhead	Faster when compared with dataset.

What is Serialization ? What are the Types of Serialization and their differences?

Serialization:
It is the process of converting an object to a form suitable for either making it persistent or tranportable.
Deserialization is the reverse of this and it converts the object from the serialized state to its original state.

Types:
1. Binary
2. XML

Differences:

Sno	Binary	XML
1	It preserves type fidelity , which is useful for preserving the state of the object between transportation and invocation.	It doesnt preserves type fidelity and hence state cant be maintained.
2	As it is the open standard its widely used	Not that much compared to Binary.

What is the difference between CCW and RCW ?

Sno	CCW	RCW
1	COM to .NET communication happens through COM Callable Wrapper	.NET to COM Communication happens through Remote Callable Wrappter