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C# Interview Questions and Answers( NEW )
C# Interview Questions And Answers
General Questions
Q1:Does C# support
multiple-inheritance?
Ans:No.
Q2:Who is a protected class-level
variable available to?
Ans:It is available to any sub-class (a class inheriting this class).
Q3:Are private class-level variables
inherited?
Ans:Yes, but they are not accessible. Although they are not visible
or accessible via the class interface, they are inherited.
Q4:Describe the
accessibility modifier “protected internal”.
Ans:It is available to classes that are within the same assembly and
derived from the specified base class.
Q5:What’s the top .NET class that everything is derived from?
Ans:System.Object.
Q6:What does the term immutable mean?
Ans:The data value may not be changed. Note: The variable
value may be changed, but the original immutable data value was discarded and
a new data value was created in memory.
Q7:What’s the difference between System.String and
System.Text.StringBuilder classes?
Ans:System.String is immutable. System.StringBuilder was designed with
the purpose of having a mutable string where a variety of operations can be
performed.
Q8:What’s the advantage of using System.Text.StringBuilder over
System.String?
Ans:StringBuilder is more efficient in cases where there is a large
amount of string manipulation. Strings are immutable, so each time a string
is changed, a new instance in memory is created.
Q9:Can you store multiple data types in System.Array?
Ans:No.
Q10:What’s the difference between the
System.Array.CopyTo() and System.Array.Clone()?
Ans:The Clone() method returns a new array (a shallow copy) object
containing all the elements in the original array. The CopyTo() method copies
the elements into another existing array. Both perform a shallow copy. A
shallow copy means the contents (each array element) contains references to
the same object as the elements in the original array. A deep copy (which
neither of these methods performs) would create a new instance of each
element's object, resulting in a different, yet identacle object.
Q11:How can you sort the elements of the array in
descending order?
Ans:By calling Sort() and then Reverse() methods.
Q12:What’s the .NET collection class that allows an element to be
accessed using a unique key?
Ans:HashTable.
Q13:What class is underneath the SortedList class?
Ans:A sorted HashTable.
Q14:Will the finally block get executed if an
exception has not occurred?
Ans:Yes.
Q15:What’s the C# syntax to catch any possible exception?
Ans:A catch block that catches the exception of type System.Exception.
You can also omit the parameter data type in this case and just write catch
{}.
Q16:Can multiple catch blocks be executed for a single try
statement?
No. Once the proper catch block processed, control is transferred to
the finally block (if there are any).
Q17:Explain the three services model commonly
know as a three-tier application.
Ans:Presentation (UI), Business (logic and underlying code) and Data
(from storage or other sources).
Class Questions
Q18:What
is the syntax to inherit from a class in C#?
Ans:Place a colon and then the name of the base class.
Example: class MyNewClass : MyBaseClass
Q19:Can you prevent your class from being inherited by
another class?
Ans:Yes. The keyword “sealed” will prevent the class from being
inherited.
Q20:Can
you allow a class to be inherited, but prevent the method from being
over-ridden?
Ans:Yes. Just leave the class public and make the method sealed.
Q21:What’s an abstract class?
Ans:A class that cannot be instantiated. An abstract class is a
class that must be inherited and have the methods overridden. An
abstract class is essentially a blueprint for a class without any
implementation.
Q22:When do you absolutely have to
declare a class as abstract?
Ans:1. When the class itself is inherited from an
abstract class, but not all base abstract methods have been overridden.
2. When at least one of the methods in the class is abstract.
Q23:What is an interface class?
Ans:Interfaces, like classes, define a set of properties, methods,
and events. But unlike classes, interfaces do not provide implementation. They
are implemented by classes, and defined as separate entities from classes.
Q24:Why can’t you specify the
accessibility modifier for methods inside the interface?
Ans:They all must be public, and are therefore public by default.
Q25:Can you inherit multiple
interfaces?
Ans:Yes. .NET does support multiple interfaces.
Q26:What happens if you inherit
multiple interfaces and they have conflicting method names?
Ans:It’s up to you to implement the method inside your own class, so
implementation is left entirely up to you. This might cause a problem on a
higher-level scale if similarly named methods from different interfaces expect
different data, but as far as compiler cares you’re okay.
To Do: Investigate
Q27:What’s the difference between an
interface and abstract class?
Ans:In an interface class, all methods are abstract - there is no
implementation. In an abstract class some methods can be concrete. In
an interface class, no accessibility modifiers are allowed. An abstract class
may have accessibility modifiers.
Q28:What is the difference between a
Struct and a Class?
Ans:Structs are value-type variables and are thus saved on
the stack, additional overhead but faster retrieval. Another difference is
that structs cannot inherit.
Method and Property Questions
Q29:What’s the implicit name of the
parameter that gets passed into the set method/property of a class?
Ans:Value. The data type of the value parameter is defined by
whatever data type the property is declared as.
Q30:What does the keyword
“virtual” declare for a method or property?
Ans:The method or property can be overridden.
Q31:How is method
overriding different from method overloading?
Ans:When overriding a method, you change the behavior of the method
for the derived class. Overloading a method simply involves having another
method with the same name within the class.
Q32:Can you declare an
override method to be static if the original method is not static?
Ans:No. The signature of the virtual method must remain the same.
(Note: Only the keyword virtual is changed to keyword override).
Q33:What are the different ways a
method can be overloaded?
Ans:Different parameter data types, different number of parameters,
different order of parameters.
Q34:If a base class has a number of overloaded
constructors, and an inheriting class has a number of overloaded constructors;
can you enforce a call from an inherited constructor to a specific base
constructor?
Ans:Yes, just place a colon, and then keyword base (parameter list to
invoke the appropriate constructor) in the overloaded constructor definition
inside the inherited class.
Events and Delegates
Q35:What’s
a delegate?
Ans:A delegate object encapsulates a reference to a method.
Q36:What’s a multicast delegate?
Ans:A delegate that has multiple handlers assigned to it. Each
assigned handler (method) is called.
XML Documentation
Questions
Q37:Is XML case-sensitive?
Ans:Yes.
Q38:What’s the difference between //
comments, /* */ comments and /// comments?
Ans:Single-line comments, multi-line comments, and XML documentation
comments.
Q39:How do you generate
documentation from the C# file commented properly with a command-line
compiler?
Ans:Compile it with the /doc switch.
Debugging and Testing
Questions
Q40:What debugging tools come with the
.NET SDK?
Ans:1. CorDBG – command-line debugger. To use
CorDbg, you must compile the original C# file using the /debug switch.
2. DbgCLR – graphic debugger. Visual Studio .NET uses the DbgCLR.
Q41:What does assert()
method do?
Ans:In debug compilation, assert takes in a Boolean condition as a
parameter, and shows the error dialog if the condition is false. The
program proceeds without any interruption if the condition is true.
Q42:What’s the difference
between the Debug class and Trace class?
Ans:Documentation looks the same. Use Debug class for
debug builds, use Trace class for both debug and release builds.
Q43:Why are there five
tracing levels in System.Diagnostics.TraceSwitcher?
Ans:The tracing dumps can be quite verbose. For
applications that are constantly running you run the risk of overloading the
machine and the hard drive. Five levels range from None to Verbose, allowing
you to fine-tune the tracing activities.
Q44:Where is the output
of TextWriterTraceListener redirected?
Ans:To the Console or a text file depending on the parameter
passed to the constructor.
Q45:How do you debug an
ASP.NET Web application?
Ans:Attach the aspnet_wp.exe process to the DbgClr debugger.
Q46:What are three test
cases you should go through in unit testing?
Ans:1. Positive test cases
(correct data, correct output).
2. Negative test cases (broken or missing data, proper handling).
3. Exception test cases (exceptions are thrown and caught properly).
Q47:Can you change the
value of a variable while debugging a C# application?
Ans:Yes. If you are debugging via Visual Studio.NET,
just go to Immediate window.
ADO.NET and Database
Questions
Q48:What is the role of the DataReader class
in ADO.NET connections?
Ans:It returns a read-only, forward-only rowset from the data
source. A DataReader provides fast access when a forward-only sequential read
is needed.
Q49:What are advantages
and disadvantages of Microsoft-provided data provider classes in ADO.NET?
Ans:SQLServer.NET data provider is high-speed and
robust, but requires SQL Server license purchased from Microsoft. OLE-DB.NET
is universal for accessing other sources, like Oracle, DB2, Microsoft Access
and Informix. OLE-DB.NET is a .NET layer on top of the OLE
layer, so it’s not as fastest and efficient as SqlServer.NET.
Q50:What is the wildcard
character in SQL?
Ans:Let’s say you want to query database with LIKE for all employees
whose name starts with
La.
The wildcard character is %, the proper query with LIKE would involve ‘La%’.
Q51:Explain ACID rule of
thumb for transactions.
Ans:A transaction must be:
1. Atomic - it is one unit of work
and does not dependent on previous and following transactions.
2. Consistent - data is either committed or roll back, no “in-between”
case where something has been updated and something hasn’t.
3. Isolated - no transaction sees the intermediate results of the
current transaction).
4. Durable - the values persist if the data had been committed even if
the system crashes right after.
Q52:What connections does
Microsoft SQL Server support?
Ans:Windows Authentication (via Active Directory) and SQL Server
authentication (via Microsoft SQL Server username and password).
Q53:Between Windows
Authentication and SQL Server Authentication, which one is trusted and which
one is untrusted?
Ans:Windows Authentication is trusted because the username
and password are checked with the Active Directory, the SQL Server
authentication is untrusted, since SQL Server is the only verifier
participating in the transaction.
Q54:What does the Initial
Catalog parameter define in the connection string?
Ans:The database name to connect to.
Q55:What does the Dispose
method do with the connection object?
Ans:Deletes it from the memory.
To Do: answer better. The current answer
is not entirely correct.
Q56:What is a
pre-requisite for connection pooling?
Ans:Multiple processes must agree that they will share the
same connection, where every parameter is the same, including the security
settings. The connection string must be identical.
Assembly Questions
Q57:How
is the DLL Hell problem solved in .NET?
Ans:Assembly versioning allows the application to specify not only
the library it needs to run (which was available under Win32), but also the
version of the assembly.
Q58:What are the ways to deploy an
assembly?
Ans:An MSI installer, a CAB archive, and XCOPY command.
Q59:What is a satellite assembly?
Ans: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.
Q60:What namespaces are necessary to
create a localized application?
Ans:System.Globalization and System.Resources.
Q61:What is the smallest unit of execution in
.NET?
Ans:an Assembly.
Q62:When should you call the garbage
collector in .NET?
Ans:As a good rule, you should not call the garbage
collector. However, you could call the garbage collector when you are done
using a large object (or set of objects) to force the garbage collector to
dispose of those very large objects from memory. However, this is usually not
a good practice.
Q63:How do you convert a value-type to
a reference-type?
Ans:Use Boxing.
Q64:What happens in memory when you Box and
Unbox a value-type?
Ans:Boxing converts a value-type to a reference-type, thus
storing the object on the heap. Unboxing converts a reference-type to a
value-type, thus storing the value on the stack.
More>>>
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