C# Interview Questions

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.

Early binding is best. Because any errors can be resolved at compile time. Late binding is at Run Time

yes. Finally will be executed even if the exception hasn't occurred. Catch all statement.

Code
try{}
catch{}
 
Or
 
try{}
catch(Exception e){}

Yes. Finally block will always execute whether execption occur or not.

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...

Threads

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.

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 ...

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...

This is how I would answer: 1) Strings are immutable and once created, cannot be changed. Hence, strings are best used in cases when you need thread safety and features where strings will not change,...

Properties combine the behavior of method & variable.

Properties are members of classes. They are also used in structs and interfaces. Properties are an extension of fields but they do not designate storage locations. Properties provide a flexible mech...

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...

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.

Encoding is a Format, it could be binary or soap or MTOM

This is more elegant and efficient? Disagree.

It is far more elegant and efficient to do something like

Array.Sort(arr, delegate(int x, int y) { return y.CompareTo(x); });

An abstract class is a class that cannot be instantiated. The purpose of an abstract class is to provide a common definition of a base class that multiple derived classes can share. For example, a cla...

All of the above

D all of the above

Early binding is better. You can make your objects strongly type and resolve the errors if any at compile time instead of runtime

The polymorphism is achieved by early binding and late binding Early Binding: Compiler bind the objects to methods at the compile time.This is called early binding or static binding.Function overloa...

// and /* */

A) /*Is used for multiple
lines omments */
// and
B) // is used for singlr line comment

From the System.Object class is correct, all value types derive from System.Value Type which in-turn derives from System.Object.

(A) System.Object class

Instance equals - because Object has instance Equals

Instance referenceequals - because Object has static ReferenceEquals

Instance Gettype - because Object has instance GetType

StaticEquals and ReferenceEquals are not members of instance class object

In a typical multiple-tier implementation, the steps for creating and refreshing a DataSet, and in turn, updating the original data are to: 1. Build and fill each DataTable in a DataSet with data fro...

We can also use bulk upload functionality of CSharp

Serialization is a process of converting an object into a stream of data so that it can be is easily transmittable over the network or can be continued in a persistent storage location.

Serialization in .NET allows the programmer to take an instance of an object and convert it into a format that is easily transmittable over the network, or even stored in a database or file system. Th...

Does some one dig the code with Reflector?? In deed, according the Reflector, see code.... it's clear only ToString() can be called. "c# public virtual void System.TextWriter....

The answer is C

Ultimately ToString() is called. Depending on what overload is used when calling Console.WriteLine() either Append or AppendFormat will be called called then ToString()

An event is a member that enables a class or object to provide notifications. An event is declared like a field except that the declaration includes an event keyword and the type must be a delegate ty...

False

event is an instance of delegate which is used to notify some action of an object to other object.

C# provides a set of predefined struct types called the simple types. The simple types are identified through reserved words, but these reserved words are simply aliases for predefined struct types in the System namespace.
{sbyte, byte, short, ushort, int, uint, long, ulong, and char}

Well, it is needed if for some reason you have conflicting names. Silly example, but suppose you declare a variable with the name DateTime, and to be very funny (sarcasm) you also define a variable na...