C#.Net Interview Questions and Answers

What Is NUnit?
Answer :: NUnit is a unit-testing framework for all .Net languages. Initially ported from JUnit, the current
production release, version 2.2, is the fourth major release of this xUnit based unit testing tool for Microsoft
.NET. It is written entirely in C# and has been completely redesigned to take advantage of many .NET
language features, for example custom attributes and other reflection related capabilities. NUnit brings xUnit to
all .NET languages. .... Read More
In the NUnit test framework, which attribute must adorn a test class in order for it to be picked up by the NUnit GUI?
Answer :: I think it will be TestFixtureAttribute
The test fixture attribute is applied to a class that contains a suite of related test cases. If an error occurs while
initializing the fixture or if at least one of the test cases within the fixture fails, then the fixture itself will be
deemed to have failed. Otherwise the fixture will pass. Output from the fixture, such as text written to the
console, is captured by the framework and will be included in the test report.
A test fixture has no timeout by default. This may be changed using the TimeoutAttribute.
This attribute may be omitted whenever a test fixture class contains at least one test method or test parameter
or when other MbUnit attributes are applied to the test fixture class. This is almost always the case unless for
some reason you have an empty fixture.
The class must have a public default constructor. The class may not be static. .... Read More
When should you call the garbage collector in .NET?
Answer :: when Memory is low.... .... Read More
What is a satellite assembly?
Answer ::
<span style="font-size: 10pt; font-family: Verdana;">When you write a multilingual or multi-cultural application in
.NET, and want to distribute the core application separately from the localized modules, the localized
assemblies that modify the core application are called satellite assemblies.<o:p></o:p> .... Read More
What’s a multicast delegate?
Answer ::
<span style="font-size: 10pt; font-family: Verdana;">It&rsquo;s a delegate that points to and eventually fires off
several methods.<o:p></o:p> .... Read More
What’s a delegate?
Answer :: <span style="font-size: 10pt; font-family: Verdana;">A delegate object encapsulates a reference to a
method. .... Read More
What are the different ways a method can be overloaded?
Answer :: Different data types, different number, and different order of paramenter. .... Read More
How is method overriding different from method overloading?
No Accepted answer found .... View Answer
What’s the difference between an interface and abstract class?
No Accepted answer found .... View Answer
What is the difference between a Struct and a Class?
No Accepted answer found .... View Answer
What is an interface class?
No Accepted answer found .... View Answer
What’s an abstract class?
Answer :: Suppose you are implementing a new class that you want others to derive from. lets say...Car, the
abstract class might look something like this:
public abstract class Car
{
public abstract void RemoveAllFuses();
public abstract void StartEngine();
}
as you see, abstract class has methods that are NOT implemented, but just declared, the deriving class should
implement them.
The Car exaple here state an abstract Car, and its exactly what it is, abstract, a car with no name and no
functionality yet, but with some declaration on what it does (of course regular car has more than StartEngine
and RemoveAllFuses).
now each car who derive from the abstract one must implement both methods.
for example:
class Seat : Car
{
public override void RemoveAllFuses()
{
}
public override void StartEngine()
{
}
}
thats great...but now the question:
What should you do in order NOT to let a certain method withing the derived to be called?
eg, what whould you do to prevent this:
class MyCar : Seat
{
static void Main(string[] args)
{
MyCar c= new MyCar();
try
{
c.RemoveAllFuses();
}
catch (Exception e)
{
System.Console.WriteLine(e.Message);
}
}
}
you ask why? well, i say, Seat Car maker did not want to implement RemoveAllFuses.
the answer is really in the code, in the try block.
in the Seat Class, we should throw an exception in order to make that method unavailable, and at the same
time, we have actually implemented it. this is what you do if you DONT NEED ALL METHODS from a derived
class.
the modifed Seat class is:
class Seat : Car
{
public override void RemoveAllFuses()
{
throw new MethodAccessException();
}
public override void StartEngine()
{
}
}
MethodAccessException is being explained as "Attempt to access the method failed"...as simple as that.
.... Read More
What’s the C# syntax to catch any possible exception?
No Accepted answer found .... View Answer