c# Interview Questions (Junior Developer)

• What is the difference between a value type and a reference type?
• When checking true false evaluations what is the difference between "&" and "&&"?
• Is  datetime a value type or a reference type?
• Is there any way to assign null to an int?
• How to get a distinct list from an array?
• What is boxing?
• What are generics and did you ever use them? What are the advantages of using generics?
• What is the difference between a hashtable and a dictionary?
• Can a dictionary have duplicate keys? Which structure can you use that allows duplicate keys?
• What does sealed mean and give an example of a c# system class that is sealed
• Can an abstract class have a constructor?
• Can a private member be virtual?
• can an abstract method be declared virtual?
• If you had to refactor code – what steps would you take?
• What are some advantages of a singleton over a static class?
• Can you inherit a static class?
• Can a static constructor have a parameter?
• Please explain garbage collection in .net
• Which interface do you need to implement to use
•                 “using” keyword
• IDisposable
•                 Foreach loops
• IEnumerable or IEnumerable<T>
•                 Custom sorting
• IComparable<T>
• Is there any way to find out the value of a private member of a class?
• Can a static procedure be recursive?
• An abstract class can have a public constructor? A private contructor?
• Whats the order of contructors with an inherited class? Static constructors?
• What is the difference between finalize and dispose?
• Are constructors inherited from base classes? 
• in c# can you change the access level of a derived overwritten procedure protected to public?
• if you have a derived class what difference is there between declaring "new" or "override" in a procedure?
• if a base class has a protected member, can the child class override to public?
• in c# - cannot change access modifiers when overriding 'protected' inherited member
• can you declare a protected class in a namespace
• no -Elements defined in a namespace cannot be explicitly declared as private, protected, or protected internal
• Can you declare a class to be private?
• Only with nested classes
• what is the default accessor for a class? for a class member?
• class - internal, member - private
• var something = 100.50F; what is the type of something?
• what is the difference between a const and a readonly value?
• what is the difference between typeof, GetType(), and is?
• what is the difference between ref and out?
• what is the difference between as and casting?
• what is the purpose of partial classes?
• if your argument is a reference type , does it make a difference if you use the ref keyword?
• what is the difference between Equals ,ReferenceEquals and "=="
• what is the value of y here:        int y = x ?? -1;
• How would you remove duplicate entries in an array?
• what is the value of 5/2 in c#?
• can you share namespaces over projects?
• Does array.Clone() create a deep or shallow copy?
• does this compile?
•     {
•                 string s = "gdfgd";
•             }
•             {
•                 string s = "gdfgd";
•             }
•         }