Description : List out the differences between Array and ArrayList in C#?
Last Answer : Array stores the values or elements of the same data type but ArrayList stores values of different data types. Arrays will use the fixed length but ArrayList does not use fixed length like an array.
Description : Write some code that uses an ArrayList.
Last Answer : ArrayList list = new ArrayList(); list.Add("Hello"); list.Add("World");
Description : Can an ArrayList be ReadOnly?
Last Answer : Yes
Description : What is an ArrayList?
Last Answer : A data structure from System.Collections that can resize itself.
Description : Define what is the difference between Array and LinkedList?
Last Answer : The array is a simple sequence of numbers which are not concerned about each other’s positions. they are independent of each other’s positions. adding, removing or modifying any array element is very easy. Compared to arrays, a linked list is a complicated sequence of numbers.
Description : What’s the difference between the System.Array.CopyTo() and System.Array.Clone()?
Last Answer : The first one performs a deep copy of the array, the second one is shallow.
Last Answer : The Clone() method returns a new array (a shallow copy) object containing all the elements in the original array. The CopyTo() method copies the elements into another existing array. Both perform a ... create a new instance of each element's object, resulting in a different, yet identacle object.
Description : Can you store multiple data types in System.Array?
Last Answer : No.
Description : How can you sort the elements of the array in descending order?
Last Answer : By calling Sort() and then Reverse() methods.
Description : Write some code to implement a jagged array.
Last Answer : // Declare the array of two elements: int[][] myArray = new int[2][]; // Initialize the elements: myArray[0] = new int[5] {1,3,5,7,9}; myArray[1] = new int[4] {2,4,6,8};
Description : Write some code to implement a multidimensional array.
Last Answer : int[,] b = {{0, 1}, {2, 3}, {4, 5}, {6, 7}, {8, 9}};
Description : Does the size of an array need to be defined at compile time.
Last Answer : No
Description : Can you resize an array at runtime?
Description : What is array rank?
Last Answer : The dimension of the array.
Description : What is the default index of an array?
Last Answer : 0
Description : Write some code that declares an array on ints, assigns the values: 0,1,2,5,7,8,11 to that array and use a foreach to do something with those values.
Last Answer : int x = 0, y = 0; int[] arr = new int [] {0,1,2}; foreach (int i in arr) { if (i%2 == 0) x++; else y++; }
Description : Difference between Vector and ArrayList ?
Last Answer : Ans. Vectors are synchronized whereas Array lists are not.
Description : Define what are the difference between const and readonly?
Last Answer : A const cannot be static, while readonly can be static. A const need to be declared and initialized at declaration only, while a readonly can be initialized at the declaration or by the code in the ... A const's value is evaluated at design time, while a read-only value is evaluated at runtime.
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 : Define what is the difference between a class and an Interface?
Last Answer : 1. Abstract classes can have implementations for some of its members, but the interface can't have implementation for any of its members. 2. Interfaces cannot have fields whereas an ... 5. Abstract class members can have access modifiers whereas interface members cannot have access modifiers.
Description : Define what is the main difference between a sub procedure and a function?
Last Answer : Sub procedures do not return a value, while functions do.
Description : Define what is a basic difference between the while loop and do-while loop in C#?
Last Answer : The while loop tests its condition at the beginning, which means that the enclosed set of statements run for zero or more number of times if the condition evaluates to true. The do while loop iterates a set of statements at least once and then checks the condition at the end.
Description : Define what is the difference between compile-time polymorphism and run-time polymorphism?
Last Answer : Compile time Polymorphism Compile time Polymorphism also known as method overloading. Method overloading means having two or more methods with the same name but with different signatures. Run time ... or more methods with the same name, same signature but with a different implementation.
Description : Define what is the difference between Shadowing and Overriding?
Last Answer : Overriding redefines only the implementation while shadowing redefines the whole element. In overriding derived classes can refer the parent class element by using “ME” keyword, but in shadowing you can access it by “MY BASE”.
Description : Define what is the difference between CONST and READONLY?
Last Answer : Both are meant for constant values. A const field can only be initialized at the declaration of the field. A read-only field can be initialized either at the declaration or.
Description : Define what is the difference between console and window application?
Last Answer : A console application, which is designed to run at the command line with no user interface. A Windows application, which is designed to run on a user’s desktop and has a user interface.
Description : Define what is the difference between static and instance methods?
Last Answer : A method declared with a static modifier is a static method. A static method does not operate on a specific instance and can only access static members. A method declared without a static modifier is an ... can be explicitly accessed as this. It is an error to refer to this in a static method.
Description : Define what is the difference between break and continue statement?
Last Answer : The break statement is used to terminate the current enclosing loop or conditional statements in which it appears. We have already used the break statement to come out of switch statements. The ... statement stops the current iteration and simply returns control back to the top of the loop.
Description : Define what is the difference between value type and reference type?
Last Answer : 1. Value types are stored on the stack and when a value of a variable is assigned to another variable. 2. Reference types are stored on the heap, and when an assignment between two reference variables occurs.
Description : Define what is the difference between Custom Control and User Control?
Last Answer : Custom Controls have compiled the code (DLLs), easier to use, difficult to create, and can be placed in toolbox. Drag and Drop controls. Attributes can be set visually at design time. Can be ... the toolbox and dragged - dropped from it. A User Control is shared among the single application files.
Description : Define what is the difference between string keyword and System. String class?
Last Answer : String keyword is an alias for System. String class. Therefore, the System. String and string keyword are the same, and you can use whichever naming convention you prefer. The String class provides many methods for safely creating, manipulating, and comparing strings.
Description : Define what is the difference between constants, readonly and, static?
Last Answer : 1. Constants: The value can’t be changed. 2. Read-only: The value will be initialized only once from the constructor of the class. 3. Static: Value can be initialized once.
Description : Define what is the difference between Class And Interface?
Last Answer : Class is a logical representation of an object. It is a collection of data and related sub procedures with a definition. The interface is also a class containing methods which are not having any definitions. Class does not support multiple inheritances. But interface can support.
Description : Define what are the difference between Structure and Class?
Last Answer : 1. Structures are value type and Classes are a reference type 2. Structures can not have contractors or destructors. 3. Classes can have both contractors and destructors. 4. Structures do not support Inheritance, while Classes support Inheritance.
Description : Define what is the difference between “out” and “ref” parameters in C#?
Last Answer : “out” parameter can be passed to a method and it need not be initialized whereas “ref” parameter has to be initialized before it is used.
Description : Define what is the difference between “throw ex” and “throw” methods in C#?
Last Answer : “throw ex” will replace the stack trace of the exception with stack trace info of rethrowing point. “throw” will preserve the original stack trace info.
Description : Define what is the difference between “finalize” and “finally” methods in C#?
Last Answer : Finalize – This method is used for garbage collection. So before destroying an object, this method is called as part of the cleanup activity. Finally – This method is used for executing the code irrespective of exception occurred or not.
Description : Define what is the difference between “dispose of” and “finalize” variables in C#?
Last Answer : Dispose of - This method uses interface - IDisposable interface and it will free up both managed and unmanaged codes like - database connection, files, etc. Finalize - This method is called internally ... called explicitly. It is called by the garbage collector and can't be called from the code.
Description : Define what is the difference between “constant” and “read-only” variables in C#?
Last Answer : Const keyword is used for making an entity constant. We cannot modify the value later in the code. Value assigning is mandatory to constant variables. read-only variable value can be changed ... and value to read-only variables can be assigned in the constructor or at the time of declaration.
Description : What is purpose of Assembly Linker or define SDK Tool in .NET Framework?
Last Answer : Answer: In .NET whole the working should be with the helps of DLLs.So all of Visual Studio .Net compilers gernate assemblies or u can say dll.If we want to create an assembly with ... Studio .Net .This multi file can contain modules that are written in diffrenet langauage in one application.
Description : What does the Initial Catalog parameter define in the connection string?
Last Answer : The database name to connect to.
Description : Write code to define and use your own custom attribute.
Last Answer : (From MSDN) // cs_attributes_retr.cs using System; [AttributeUsage(AttributeTargets.Class|AttributeTargets.Struct, AllowMultiple=true)] public class Author : Attribute { public Author(string name) { this.name ... double version; string name; public string GetName() { return name; } }
Description : Define what are the advantages of getting and set properties in C#?
Last Answer : 1. The get property accessor is used to return the property value. 2. The set property accessor is used to assign a new value.
Description : Define what is a New modifier?
Last Answer : The new modifier hides a member of the base class. C# supports only hide by signature.
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.