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How do you create a pure virtual function in c#?
asaf122
- Jan 28th, 2010
As I know pure virtual doesn't exist in C# (it's C++ concept)If you are using abstract class you cannot make instance of this class but you can implement functions.
richa2008
- Dec 4th, 2008
User abstract modifier on method.Class must also be marked as abstract.An abstract method cannot have implementation.
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MFC GUI without flickering
User is continuously entering some in GUI and it is doing some background processing and updating in GUI. How to do it without flickering the GUI using MFC?Thanks,Raja Gregory
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Native Keyword
What is native keyword in C#?
ebabu
- Jan 10th, 2010
For native Java equlivalent keyword is extern in c#.native keyword is used Java and where as in c# extern keyword is used.Sample usage is below.[DllImport("User32.dll")] public static extern int MessageBox(int h, string m, string c, int type);
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MessageBox in ASP.NET Page
How to display and create Message box in ASP.NET using C# code?
ebabu
- Jan 9th, 2010
There are 2 ways we can achive message box functionality in ASP.Net and both are asynchronus.1. Using Ajaxpro update panel we can create message box2. Through JavaScript confrim function we can display message box.
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Shallow and Deep Copy
What is shallow and deep copy in C#? How to perform the same in C#?
ebabu
- Jan 9th, 2010
Shallow copy make a copy of data along with it's reference, for example object A has property name, by making a shallow copy to object B, and changes the name property value that will reflect in o...
gopi2008
- Apr 20th, 2008
shallow copy copies the structure of the object, deep copy copies structure as well as data.For example, consider an object called X that references objects A and B. Object B, in turn, references obje...
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Given colors, subtract the fade value and print
What is wrong with the following C# code? It should take the given colors and subtract the given fadeValue and then print out the new faded values. Please copy and paste the code into your response and fix it so that it works correctly.
using System;namespace PCD{ class MainClass { static void Main(string[] args) { int red=110; int green=220; int blue=230; getFadedColor(red,...kunalkamboj
- Mar 7th, 2008
namespace PCD{ class MainClass { static void Main(string[] args) { int red=110; int green=220; int blue=230; getFadedColor(ref red, ref green, ref blue, 10); getFaded...
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When you inherit a protected class-level variable, who is it available to?
Classes in the same namespace.
Basavarajayya
- Nov 14th, 2009
Its available only to the derived classes and not all the classes in the NameSpace
anil4kick
- Sep 26th, 2009
Protected level variable is available to only sub classes(i.e class inherited from this base class).
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C# Calender Days
How to find out how many calender days are there between two dates in c#.net?
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Editorial / Best Answer
wyverex- Member Since May-2008 | May 13th, 2008
DateTime t1 = new DateTime(2008, 5, 13);
DateTime t2 = new DateTime(2004, 2, 22);
TimeSpan span = (t1 > t2 ? t1 - t2 : t2 - t1);
Console.WriteLine(span.TotalDays);ngobeseb
- Nov 4th, 2009
Here is the better answer:DateTime fDate = DateTime.Now;int thisDay = fDate.DayOfYear; //if today's date is 31/12/2008, thisDay will be 365 and if today's date is 01/01/2009, thisDay will be 1.Therefore, you can use DayOfYear propery to get the day number in a year.
dhanu_mitra
- Jan 1st, 2009
public void DateDiff(){ DateTime startDate = DateTime.Parse("11/12/2008"); DateTime endDate = DateTime.Parse("11/12/2009"); &n...
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'this' in C#
Explain about 'this' and where and when it should be used?
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Charlito- Member Since Apr-2008 | Apr 3rd, 2008
The 'this' keyword in C# is used to reference the current class instance.
It can be optionally used as a qualifier in referencing the fields, properties or methods of the current instance of the class.chintan.desai
- Aug 7th, 2009
I. this keyword refer to current instance. ii.this keyword help to provide intellisense support during debugging.
Charlito
- Apr 3rd, 2008
The 'this' keyword in C# is used to reference the current class instance.It can be optionally used as a qualifier in referencing the fields, properties or methods of the current instance of the class.
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How do I make a DLL in C#?
You need to use the /target:library compiler option.
masterubaid
- Aug 7th, 2009
There is no Issue to make dll in C#...Go to Project and Select "Class Library" and work as you work in Usual FORM by making Classes or functions ....The only difference is that when we are m...
swag
- Dec 26th, 2005
Open the property page of the Project File and thenopen CommonProperties -> Genaral ->Output Typechange the output type to class library and build the application then u'll get a dll file.also i...
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Delegates and Generics in c#
What is the advantage of using delegates and Generics in c# .
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sutanu_halder- Member Since Dec-2007 | Apr 18th, 2008
Advantage of Generic:-
1. Generics provide type safety without the overhead of multiple implementations.
Ex. We can create a linked list of string.
LinkedList<string>linkList=new LinkedList<string>();
There is no need to inherit from a base type and override members.The linked list is ready
for immediate use.
2. There is no need to write code to test for the correct data type because it is enforced
at compile time. The need for type casting and the possibility of run-time errors are
reduced.
3. Generic collection types generally perform better for storing and manipulating value
types because there is no need to box the value types.
4. Generic delegates enable type-safe callbacks without the need to create multiple delegate
classes.
5.Generic delegates can also be used in dynamically generated code without requiring the
generation of a delegate type. This increases the number of scenarios in which you can use
lightweight dynamic methods instead of generating entire assemblies.
Advantage of Delegate:
Delegates are managed function pointers. they are type checked and held in spaces that can
be reclaimed by the memory manager.chintan.desai
- Aug 7th, 2009
Adding on sutanu_halder answer: 1. Delegate executes asynchronousely, while Generice execute synchronousely. 2. Delegate is not type safe. We can define anonymous method which can execute without creating delegate object in memory. Generic is type-safe.
sutanu_halder
- Apr 23rd, 2008
Advantage of Generic:-1. Generics provide type safety without the overhead of multiple implementations.Ex. We can create a linked list of string. LinkedList<string>linkList=new...
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Which of the following are predefined reference types in C#?
Skill/Topic: BeginnerA) intB) objectC) string
sdevlin555
- Jul 27th, 2009
The pre-defined reference types are object and string, where object is the ultimate base class of all other types.
samiksc
- Dec 7th, 2005
(B) and (C): 'object' and 'string' are predefined reference types. 'string' is a sealed class type which inherits directly from object.
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XML documents for a C# program can be generated using
Skill/Topic: IntermediateA) /xmldoc switchB) /doc switchC) /gendoc switch
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The field variables in a class or a struct in C# are by default given a value of zero
Skill/Topic: BeginnerA) TrueB) False
mwelo
- Jun 19th, 2009
The right answer is true not false! The rules are slightly different between classes and structs...
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An assembly can be stored across multiple files?
Skill/Topic: IntermediateA) YesB) No
vijee
- Jun 21st, 2009
Yes.Assembly is a collection of functionality that is built, versioned, and deployed as a single implementation unit (as one or more files).
leejo
- Dec 8th, 2005
Yes. The manifest inside the assembly will hold the details of all the files. ie it will store the name of the resource file etc.
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Delegate
The following code illustrates a situation where a boss wants to keep track of the work progress of its subordinates: using System;namespace BigCompany { public class Boss { public void WorkerPercentageDone(int percentage) { Console.WriteLine("I am the boss, and my worker is " + percentage + "% done."); } } public class Worker { Boss boss = null; public Worker(Boss boss) ...
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Namespaces are used to
Skill/Topic: IntermediateA) Separate assembliesB) Create a unique name for an assemblyC) Avoid name clashes between data types
khader
- Oct 13th, 2006
All the above are correct.
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How we can set the background color of a particular sheet in VSTO
Abhi_13
- Apr 30th, 2009
You need to use the color class to change the background colour -ex :: this.BackGroundColor=Color.Red();
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Structs and classes support inheritance
Skill/Topic: IntermediateA) TrueB) FalseExplanation: Only classes can inherit. Structs can’t.
deepak.dagar
- Apr 29th, 2009
Actually Interfaces are 'Implemented' & never 'Inherited'.So this sounds technically correct that Structs does not support Inheritance.
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.NET FRAMEWORK
.NET FRAMEWORK1. What is .NET Framework?The .NET Framework has two main components: the common language runtime and the .NET Framework class library.You can think of the runtime as an agent that manages code at execution time, providing core services such as memory management, thread management, and remoting, while also enforcing strict type safety and other forms of code accuracy that ensure security...
PrasannaJugade
- Apr 10th, 2009
The .NET framework is a platform over which multiple languages are running.The 2 main components are 1. FRAMEWORK CLASS LIBRARY2. COMMON LANGUAGE RUNTIMEIt's features like CTS provide Cross Langua...
C# Interview Questions
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