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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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How do I get deterministic finalization in C#?
In a garbage collected environment, it's impossible to get true determinism. However, a design pattern that we recommend is implementing IDisposable on any class that contains a critical resource. Whenever this class is consumed, it may be placed in a using statement, as shown in the following example: using(FileStream myFile = File.Open(@"c:temptest.txt", FileMode.Open)){int fileOffset = 0;while(fileOffset...
anupamsh
- Mar 7th, 2012
That is true. A class implementing the interface IDisposable can be used in the using statement, something like: "c# using (MyClass objMyClass = new MyClass()) { objMy...
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Constructors can not be static ?
Sivavt
- Mar 25th, 2012
Yes, there can be a static constructor. It will be at class level & executed just once. It is totally in run-times control & not sure of when this will be executed. But, it is assured that it will be executed before creating instance of the class.
Aashish Chachra
- Mar 2nd, 2012
A class can have only one static constructor. Static constructor can not have any parameter. Static constructor cannot have any access specifier, not even private. It is used to initialize the static ...
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Any process can be divided into multiple
Skill/Topic: AdvancedA) ProgramsB) ThreadsC) Application domains
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LordAlex- Member Since Nov-2011 | Nov 5th, 2011
Application domains are typically created by runtime host( i.e. Windows process/program). Application domains provide an isolation boundary for security,.... .NET program is an Assembly loading into an Application domain. Threads are the operating system construct used by the common language runtime to execute code in Application domains. Therefore, for .NET, Process (runtime host) -> Application Domains -> Assemblies (.NET programs)-> Managed Threads.
Sivavt
- Mar 25th, 2012
App domains. This could be best understood by taking an example of a browser program. A browser may run multiple web applications simultaneously. All these could be run in separate app domains. So, i...
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Will finally block get executed if the exception had not occurred?
Yes. What is the C# equivalent of C++ catch (…), which was a catch-all statement for any possible exception?
Sivavt
- Mar 25th, 2012
Yes. Finally will be executed even if the exception hasn't occurred. Catch all statement.
Code- try{}
- catch{}
- Or
- try{}
- catch(Exception e){}
Dadan Tiwari
- Feb 13th, 2012
Yes. Finally block will always execute whether execption occur or not.
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Late and early binding
which one best in late binding and early binding? What is the difference between them ?
Sivavt
- Mar 26th, 2012
Early binding Or Compile time Or static binding: Assigning of object to type reference happens at compile time.
Late binding Or Run time Or Dynamic binding: Assigning of object to type reference happens at run time.
Early binding is efficient while late binding provides flexibility to programmers.Devender Thadkapalli
- Nov 28th, 2011
Early binding is best. Because any errors can be resolved at compile time. Late binding is at Run Time
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Operator Overloading
Why should we have to overload ==(equals) and !=(not equals) operators in same program? If any one is not overloaded it gives error. Same with =?
kabilan
- Jan 3rd, 2012
Same class name and different parameters within one class
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All .NET code have to be CLS compliant
Skill/Topic: IntermediateA) TrueB) False
Sivavt
- Mar 26th, 2012
Not required. If you want your code to be CLS complaint use the annotation CLScompliant(true)
Ravi Kumar
- Dec 3rd, 2011
False All .Net code need not be CLS compliant if you are going to write all modules using single .Net language. However, if you are going to use different .Net language for different modules then you...
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When do you absolutely have to declare a class as abstract ?
(as opposed to free-willed educated choice or decision based on UML diagram)? When at least one of the methods in the class is abstract. When the class itself is inherited from an abstract class, but not all base abstract methods have been over-ridden.
Devender Thadkapalli
- Nov 28th, 2011
When you do not want to create an object of the class and want to provide some abstract implementation
ex: Class HumanBeing. No Point of creating a class human being. You can create Men or Women out of it an create an object of the derived class -
Following are the collections in C#:
Skill/Topic: AdvancedA) structsB) enumC) dictionariesExplanation: Ans. b & c. a isn’t a collection .
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LordAlex- Member Since Nov-2011 | Nov 5th, 2011
All collections directly or indirectly should implement the ICollection interface or the ICollection(Of T) generic interface. If you check System.Array you will see ICollection interface in there. Correct answer is C, it doesn't matter that there are methods that can provide arrays of Names and Values. Because if you are reasoning like this, it means bject.ToString().ToCharArray() cause all classes are being collections.
LordAlex
- Nov 5th, 2011
All collections directly or indirectly should implement the ICollection interface or the ICollection(Of T) generic interface. If you check System.Array you will see ICollection interface in there. Co...
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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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C# sealed variables
I have taken a windows application and a button control in it.I want to declare a variable as a sealed and use that variable with in same class as we cannot use in other class. class test { public sealed int x = 5; public void abc() { MessageBox.Show(x.ToString()); } } class best :test { ...
Sivavt
- Mar 29th, 2012
Keyword sealed can be used with class declaration to prevent it from being sub-classed.
Keyword sealed can be used in method declaration to prevent it from being overridden.
Rajeeva
- Sep 4th, 2011
To restrict users from inheriting the class by sealing the class using "sealed" keyword i.e. no class can be drieved from a sealed class. both Class and Method can be sealed, in that case Method cannot be overridden. -
By declaring a base class function as virtual we allow the function to be overridden in subclasses
A) TrueB) FalseExplanation: If a function is declared virtual it needs to be overridden in subclass
Sivavt
- Mar 29th, 2012
It is not mandatory for a derived class to override the virtual base method. Nevertheless, derived class can opt to override the virtual base method to redefine the functionality.
Dinesh M Yadav
- Aug 28th, 2011
The answer is A) TRUE. If you declare a virtual method in a class , its not mandatory to override it in the sub class. However, In case of abstract class, the answer would be B) False since if you ...
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My switch statement works differently! Why?
C# does not support an explicit fall through for case blocks. The following code is not legal and will not compile in C#: switch(x){case 0:// do somethingcase 1:// do something in common with 0default:// do something in common with//0, 1 and everything elsebreak;}To achieve the same effect in C#, the code must be modified as shown below (notice how the control flows are explicit): class Test{public...
TheOutlander
- Aug 21st, 2010
Most of the other answers are right, but there is a caveat.Empty cases are allowed to fall through. However, the last case statement always needs a break - empty or not.
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How to clear screen using c# console application...?like clrscr() in c++..!
Anuj Malik
- Oct 5th, 2012
Console.Clear(); its work absolute in c# "c# using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace ConsoleApplication9 { class stud...
amreenkhader
- Jan 20th, 2012
To clear the screen we can use the clrscr() command followed by ; to clear the input given to the program
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Can we write Dotnet Console program in Unix
Can we write Dotnet Console program in Unix ? If yes Give one example.
TheDentist
- Apr 23rd, 2013
If you write in Java then the application will run in a JRE on UNIX but you have to compile the application on Windows first. Then deploy it to UNIX.
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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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The following code fails. Why?
int a = 5; int b = 5; object oa = a; object ob = b; Debug.Assert(oa == ob, "oa is not equal ob");
chidski
- Oct 17th, 2013
Given code fails bcoz. debug result is wrong.. Please see below int a = 5; int b = 5; object oa = a; object ob = b; Debug.Assert(oa != ob...
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Advantages of static class over class ?
When to use static class and when to use normal class ?
Sunil
- Aug 31st, 2014
WHEN SHOULD WE DO THIS: When we have a normal class and its methods being used very frequently in a given app, then it would speed up things if we made this class a static class with static methods. T...
Knoxille_25
- Aug 19th, 2014
A static class can make your implementation simpler and faster because you do not have to create an object in order to invoke its methods. It is useful to organize the methods inside the class in a meaningful way, such as the methods of the Math class in the System namespace.
C# Interview Questions
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