Description : Can you declare an override method to be static if the original method is not static?
Last Answer : No. The signature of the virtual method must remain the same. (Note: Only the keyword virtual is changed to keyword override)
Description : What does the keyword “virtual” declare for a method or property?
Last Answer : The method or property can be overridden.
Description : Methods must declare a return type, what is the keyword used when nothing is returned from the method?
Last Answer : void
Description : Can you declare the override method static while the original method is nonstatic?
Last Answer : No, you can’t, the signature of the virtual method must remain the same, only the keyword virtual is changed to keyword override.
Description : What si the difference between interface and abstractclass Select Answer: 1. interface contain only methods 2. we can't declare a variable for interface 3. interface contain only events 4. None 5. All
Last Answer : Ans : 2 The only Difference between Interface and Abstract class is we can declare a variable in abstract class but we can't declare in variable interface
Description : Can we declare a block as static in c#?
Last Answer : No, because c# does not support static block, but it supports static method.
Description : Define what are sealed classes in c#?
Last Answer : The sealed modifier is used to prevent derivation from a class. A compile-time error occurs if a sealed class is specified as the base class of another class.
Description : Define what are sealed classes in C#?
Description : Give an example of using a sealed class in C#?
Last Answer : Below is the sample code of sealed class in C# - class X {} sealed class Y : X {} Sealed methods - class A { protected virtual void First() { } protected virtual void Second() { } } ... inherits from class B then method - First will not be overridable as this method is sealed in class B.
Description : Explain sealed class in C#?
Last Answer : A sealed class is used to prevent the class from being inherited from other classes. So “sealed” modifier also can be used with methods to avoid the methods to override in the child classes.
Description : When do you absolutely have to declare a class as abstract?
Last Answer : 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.
Description : Write some code to declare and use properties.
Last Answer : // instance public string InstancePr { get { return a; } set { a = value; } } //read-only static public static int ClassPr { get { return b; } }
Description : How do you declare a constant?
Last Answer : public const int c1 = 5;
Description : When do you absolutely have to declare a class as abstract (as opposed to free-willed educated choice or decision based on UML diagram)?
Last Answer : When at least one of the methods in the class is abstract. When the class itself is inherited from an abstract class, but not all base abstract methods have been overridden.
Description : How can we suppress a finalize method?
Last Answer : GC.SuppressFinalize()
Description : Can we override the private virtual method in C#?
Last Answer : No. We can’t override private virtual methods as it is not accessible outside the class.
Description : Can we use “this” inside a static method in C#?
Last Answer : No. We can’t use “this” in a static method.
Description : Explain how to use the Begin and End methods on a Web Service to make an asynchronous method call.
Last Answer : Every public Web method on a Web Service can be called either synchronously or asynchronously. To make an asynchronous call to a Web method, you call the method named Begin, where is the name of ... returned by Begin. This will allow you to retrieve the actual data returned by the Web method.
Description : What is method overloading, and when is it useful?
Last Answer : Method overloading allows you to create several methods with the same name but different signatures. Overloading is useful when you want to provide the same or similar functionality to different sets of parameters.
Description : What does the Dispose method do with the connection object?
Last Answer : Deletes it from the memory. To Do: answer better. The current answer is not entirely correct.
Description : What does assert() method do?
Last Answer : 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.
Description : What are the different ways a method can be overloaded?
Last Answer : Different parameter data types, different number of parameters, different order of parameters.
Description : How is method overriding different from method overloading?
Last Answer : 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.
Description : What’s the implicit name of the parameter that gets passed into the set method/property of a class?
Last Answer : Value. The data type of the value parameter is defined by whatever data type the property is declared as.
Description : What happens if you inherit multiple interfaces and they have conflicting method names?
Last Answer : 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
Description : Can you allow a class to be inherited, but prevent the method from being over-ridden?
Last Answer : Yes. Just leave the class public and make the method sealed.
Description : Are value types are slower to pass as method parameters?
Last Answer : Yes
Description : What is an overloaded method?
Last Answer : An overloaded method has multiple signatures that are different.
Description : Write code to show how a method can accept a varying number of parameters.
Last Answer : using System; namespace Console1 { class Class1 { static void Main(string[] args) { ParamsMethod(1,"example"); ParamsMethod(1,2,3,4); Console.ReadLine(); } static void ... o in list) { Console.WriteLine(o.ToString()); } } } }
Description : How can you overload a method?
Description : Can you allow class to be inherited, but prevent the method from being overridden?
Last Answer : Yes, just leave the class public and make the method sealed.
Description : What does the keyword virtual mean in the method definition?
Last Answer : The method can be over-ridden.
Description : How’s method overriding different from overloading?
Last Answer : When overriding, you change the method behavior for a derived class. Overloading simply involves having a method with the same name within the class.
Description : What’s the implicit name of the parameter that gets passed into the class’ set method?
Last Answer : Value, and it’s datatype depends on whatever variable we’re changing.
Description : Define what is the Static Method?
Last Answer : It is possible to declare a method as Static provided that they don’t attempt to access any instance data or other instance methods.
Description : Define what is the difference between an abstract method & virtual method?
Last Answer : An Abstract method does not provide an implementation and forces overriding to the deriving class (unless the deriving class also an abstract class), whereas the virtual method has an ... abstract method does not provide implementation & forces the derived class to override the method.
Description : Which method will you call to start a thread?
Last Answer : Start
Description : Define what are the different ways a method can be overloaded?
Description : Define what is meant by method overloading?
Last Answer : Method overloading permits multiple methods in the same class to have the same name as long as they have unique signatures. When compiling an invocation of an overloaded method, the compiler uses overload resolution to determine the specific method to invoke.
Description : Can “this” be used within a static method?
Last Answer : No ‘This’ cannot be used in a static method. As only static variables/methods can be used in a static method.