CSharp Difference FAQs-1

1.Difference between C# 3.5 and C# 4.0

S.No	C# 3.5	C# 4.0
1	C# 3.5 does not support dynamic programming.	C# 4.0 supports dynamic programming through dynamic objects.
2	The dynamic keyword is not recognized in C# 3.5.	In C# 4.0, dynamic keyword is associated with objects to represent them as dynamic objects.
3	Dynamic variables cannot be created in C# 3.5.	C# 4.0 allows creation of dynamic variables.
4	In C# 3.5, method parameters cannot be specified with default values. C# 3.5 does not support optional parameters.	In C# 4.0, the method parameters can be specified with default values using optional parameters.
5	In C# 3.5, method parameters have to be specified in the same order as in method declaration in the method call. C# 3.5 does not provide named parameters.	C# 4.0 provides named parameters to represent the values of method parameters without following the order of declaration.
6	In C# 3.5, usage of ref keyword is mandatory while executing methods which are supplied by the COM interfaces.	In C# 4.0, usage of ref keyword is optional while executing methods which are supplied by the COM interfaces.
7	The COM object’s indexed properties are not recognized in C# 3.5.	The COM object’s indexed properties are recognized in C# 4.0.
8	Co-variance and contra-variance are not supported in Generics of C# 3.5.	C# 4.0 enhances Generics by introducing co-variance and contra-variance.

2.Difference between C# and VB.NET

S.No	C#	VB.NET
1	In C#, variables are declared using declarators.	In VB.NET, the variables are declared using keywords such as private, protected, friend, public, static, shared and Dim.
2	In C#, an object can only be created using new.	In VB.NET, an object can be created using new and CreateObject().
3	In C#, void is specified as the return type when a method does not return a value.	In VB.NET, Sub is used in method declaration to indicate that the method does not return any value.
4	In C#, no keyword is required to indicate an overloaded method.	In VB.NET, Overloads keyword is used to indicate an overloaded method.
5	The current object is referred using this pointer in C#.	The current object is referred as me in VB.NET.
6	Non virtual call cannot be made in C#.	To make a non-virtual call to the current object’s virtual method, MyClass is used in VB.NET.
7	Compound data type is declared in C# using class, struct and interface.	Compound data type is declared in VB.NET using Structure.
8	In C#, constructors are used to initialize an object.	In VB.NET, Sub New() is used to initialize the newly created object.
9	Object cleanup can be explicitly done by destructor in C#.	Object cleanup can be done by using Finalize method in VB.NET.
10	In C#, an object is subject to asynchronous modification using volatile keyword.	In VB.NET, an object cannot be modified in an asynchronous way.
11	In C#, all the variables have to be declared before being used.	In VB.NET, variables can be forced for explicit declaration using Option Explicit.
12	In C#, default property is defined by using indexers.	In VB.NET, default property is defined using Default.
13	In C#, base class can be referred using the keyword ‘base’.	In VB.NET, base class can be referred using the keyword ‘MyBase’.
14	Abstract class of C# can only be inherited and not instantiated.	MustInherit keyword of VB.NET is used to denote that a class can only be inherited and not instantiated.
15	Sealed keyword of C# is used to denote that a class cannot be inherited.	NotInheritable keyword of VB.NET denotes that the class cannot involve in inheritance.
16	Division can be performed in C# using / operator.	Division can be performed in VB.NET using \ operator.
17	Remainder of division can be retrieved using mod operator of C#.	Remainder of division can be retrieved using %.
18	C# does not have exponentiation operator.	In VB.NET, exponentiation can be performed using ^ operator.
19	C# has Bitwise operators namely &,| and ^.	Bitwise operators in VB.NET are And, Or, Xor.
20	Object reference variables can be compared using == operator in C#.	Object reference variables can be compared using Is operator in VB.NET.
21	The short ciruit operators in C# are && (Boolean AND) and || (Boolean OR).	The short circuit operators in VB.NET are AndAlso (Boolean AND) and OrElse (Boolean OR).

3.Difference between C# and C++

S.No	C#	C++
1	C# is a high level language that is component oriented.	C++ is a low level and indeed platform neutral programming language.
2	When compiled, C# code is converted into Intermediate language code. This intermediate language code is converted into executable code through the process called Just-In-Time compilation.	When compiled, C++ code is converted into assembly language code.
3	In C#, memory management is automatically handled by garbage collector.	In C++, the memory that is allocated in the heap dynamically has to be explicitly deleted.
4	In C# Switch Statement, the test variable can be a string.	In C++ Switch Statement, the test variable cannot be a string.
5	In C# switch statement, when break statement is not given, the fall through will not happen to the next case statement if the current case statement has any code.	In C++ switch statement, when break statement is not given, the fall through will happen to the next case statement even if the current case statement has any code.
6	In addition to for, while and do..while, C# has another flow control statement called for each.	C++ does not contain for each statement.
7	C# struts can contain only value types. The struts is sealed and it cannot have a default no-argument constructor.	C++ struts behave like classes except that the default access is public instead of private.
8	In C#, delegates, events and properties can also be specified as class members.	In C++, only variables, constructors, functions, operator overloads and destructors can be class members. Delegates, events and properties cannot be specified as class members.
9	In C#, the end of the class definition has a closing brace alone.	In C++, the end of the class definition has a closing brace followed by a semicolon.
10	The access modifiers in C# are public, private, protected, internal and protected internal.	The access modifiers in C++ are public, private, protected. C++ does not have internal and protected internal access modifiers.
11	C# has finally block in exception handling mechanism. The code statements in the finally block will be executed once irrespective of exception occurrence.	C++ does not have finally block in exception handling mechanism.
12	The exception in C# can only throw a class that is derived from the System.Exception class.	The exception in C++ can throw any class.
13	C# does not have the concept of function pointers. C# has a similar concept called Delegates.	C++ has the concept of function pointers.