.NET interview questions: - Similarities and Differences between Classes and structures.

One of the most likely .NET interview questions asked in the interview, so you should include the following points in your answers.
Similarities between classes and structures: -

• Both can have constructors, methods, properties, fields, constants, enumerations, events, and event handlers.
• Structures and classes can implement interface.
• Both of them can have constructors with and without parameter.

Both can have delegates and events.

Key differences are: -

• Structures are value types and classes are reference types. So structures use stack and classes use heap.
• Structures members cannot be declared as protected, but class members can be. You cannot do inheritance in structures.
• Structures do not require constructors while classes require.
• Objects created from classes are terminated using Garbage collector. Structures are not destroyed using GC.

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.NET interview questions :- What is the difference between class and structures ?

Answer:
1. Classes are reference types and structs are value types. So in other words class will be allocated on a heap and structs will be allocated on the stack.
2. You cannot have instance Field initializers in structs. Example

class MyClass1
{
int myVar =10; // no syntax error.
public void MyFun(
)
{
// statements
}
} 

struct MyStruct1
{
int myVar = 10; // syntax error.
public void MyFun(
)
{
// statements
}
}

3. Classes can have explicit parameter less constructors. But struts cannot have

4. Classes must be instantiated using the new operator. But struts can be

5. Classes support inheritance. But there is no inheritance for struts.( structs don’t support inheritance polymorphism )

6. Since struct does not support inheritance, access modifier of a member of a struct cannot be protected or protected internal.11. A class is permitted to declare a destructor. But a struct is not

7. classes are used for complex and large set data. structs are for simple data structures.

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