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When will we go for abstract class and when will we go for interface?
Praveen Kumar Singh
- Mar 13th, 2012
When you have some methods to be implemented as common and some methods you want to keep abstract, that time we will go for abstract class. You want to provide contract between class and object. And you don't want to implement any method as common that time we will go for interface.
sampra
- Mar 6th, 2012
Correct ans would be:Whenever there is need of having same common features among all subclasses of super class, we have to go for an abstract class.
Whenever there is no common features for subclasses of super class, we have to go for an interface.
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Exception Handling
what is the necessary for "throws" and "throw" in exception handling?? Even Though the exception has been thrown automatically and being handled by try and catch block..
Suresh Jayaraman
- Sep 23rd, 2011
if we have different layers like Dataaccess layer,Business layer ,Presentation layer. The error is in DataAccess layer,that error should come to presentation layer and we can show that error in messa...
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What is Encoding and Serialization in .Net?
ffiv77
- Feb 20th, 2012
Serialization is the process of converting an object into a stream of bytes in order to persist it to memory, a database, or a file. Its main purpose is to save the state of an object in order to be able to recreate it when needed. The reverse process is called deserialization.
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When to use string classes
when we have string builder which are mutable why we need immutable string classes in C#.
Denial
- Aug 14th, 2013
String: String are immutable that is every time you make changes to a string object, the string is destroyed and a new string is created with modifications you applied to previous string. All this is ...
Sivavt
- Mar 25th, 2012
String is immutable, meaning, if there is any change in the string value, run time allocates new memory & assign it to the string reference. For the programmer, it looks like the same string but inter...
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Browser makes a request
What happens at the serverside when a browser makes a request to the server for a particular page? Explain in detail
Rajesh Kumar
- Sep 9th, 2011
IIS recieves the request. IIS examines the extension to know if this extention is registered with asp.net?(generally aspx, ashx, asmx) IIS hands over asp.net requests to aspnet_isapi Application Man...
Vimlesh Kumar
- Sep 8th, 2011
Application life cycle: serverside process after browser 1. Request generated by Browser 2. IIS 3. ASPNet_ISAPI.dll 4. Application Manager Creates App Domain 5. Httpruntime Objects and Http...
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Which operator is used for TypeCasting
A) [ ]B) ( )C) TypeOf
Logan
- Mar 26th, 2015
B
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What is the difference between excute query and excute nonquery.?
sheetal maheshwari
- Nov 24th, 2011
: execute query is used for DDL commands whereas execute nonquery for DML.
Vimlesh Kumar
- Sep 8th, 2011
In ADO.net for Command Object you have 3 methods
1.ExecuteReader - Select statements
2.ExecuteNonQuery - DML statements(Insert,Update and Delete) - Returns Number of rows affected
3.ExecuteScalar - Returns a single value from Aggregate functions like SUM,AVG,COUNT etc
