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Uses of delegates
What is a delegate in C# and when are they commonly used in Windows Forms programming?
hdkhanna
- May 18th, 2010
Delegates are an efficient way of calling methods dynamically in C#. As long as the signature of the method called is the same as the delegate type defined it can be called. This is one way a method c...
asifdcsku
- Sep 12th, 2008
Delegeates are reference to methods Delegates are most commonly used in event handling.
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How to Do File Exception Handaling in C#
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Can you store multiple data types in System.Array?
No.
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Postbackurl and Navigateurl
What is difference between "Session" and "Session" Objects? What is the use of "postbackurl" and "navigateurl" and the differences between those two things?
azita2005
- Apr 6th, 2010
With PostbackUrl you can perform the cross page posting and you can get information from the source page. It is working with Http Post command which sends the value of the source page to the target pa...
csharpkate
- Mar 9th, 2010
The PostBackUrl property allows you to perform a cross-page post using the button control. Postbackurl can be set so that the values like those on a form, can be passed onto another page. For example ...
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Explicit Implimentation
What do you mean by Explicit Interface Implimentation? What's Interface Mapping?
azita2005
- Apr 5th, 2010
If we have a class inherits from interface, we need to implements the members of that interface. It is possibe with explicitly or implicitly way. In Explicit way, through the interface we ...
RajMarandi
- Oct 23rd, 2009
interface I1{ void someMethod();}Interface I1{ void someMethod();} class someClass:I1,I2{ void I1.someMethod() { ...
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AutoPostBack Property
There is Cancel button and OK button on page. When we click Cancel button it skips all validation controls and goes to next page.(a)Page AutoPostback of Cancel is True.(b)Page AutoPostback of Cancel is False.(c)Page AutoPostback of OK is True.(d)Page AutoPostback of OK is False.Which option is correct?
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Editorial / Best Answer
solanki.hr- Member Since Dec-2009 | Dec 10th, 2009
A button control does not have AutoPostBack property it has click event. so once you click on cancel and if its CausesValidation Property is false it will skips all validations, and if it is true it will validate the controls on the page.
AutoPostBack property is for say DropDown,textbox etc... whnever you change/enter value/keyed some caharcter in textbox or change your selection in drop down postback will happen if that control's is AutoPostBack property is true, depending on that postback you can fill values or set some values for other controls or you can do some validation against enterd or selcted values.
e.g. say tehre are 2 drop down. DropDown1 and DropDown2
DropDown2 is currently holding states of US country as in DropDown1 you have selcted US. Now you want to fill DropDown2 with state value of India.
Now if
DropDown1.AutopostBack = True;
and you change DropDown1's value from Us to India.
Page will post back to server and you can fill DropDown2 with Indian States.
Thanks,
Solankiazita2005
- Apr 1st, 2010
By default when we press the button, validation automatically occurs.With using causevalidation=false we can prevent validation.
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Public Members
Why do we use properties rather than public members?
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netdev- Member Since Oct-2009 | Oct 10th, 2009
To the user of an object, property and public member may not make much difference with respect to syntax. However, property provides the ability to combine both field and method via the get and set accessors.
MS Help for C# presents the best answer for using properties:Properties have many uses: they can validate data before allowing a change; they can transparently expose data on a class where that data is actually retrieved from some other source, such as a database; they can take an action when data is changed, such as raising an event, or changing the value of other fields.
ms-help://MS.VSCC.v90/MS.MSDNQTR.v90.en/dv_csref/html/f7f67b05-0983-4cdb-96af-1855d24c967c.htmazita2005
- Apr 1st, 2010
With Properties, we can implement validation.For example, if we have customer age and we want to add validation on the age, we can do it with properties.Another benefits of properties is that we can protect a field in a class by reading and writing it through the properties.
SeeSharp
- Mar 7th, 2010
Private data fields of class should not be exposed by making them public. Instead they can made visible using public properties in more controlled manner. Also we can make properties read only or read/write.
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How to get the capacity of an array in C#
A) Count PropertyB) Length PropertyC) Ubound method
abhi.uno
- Mar 17th, 2010
".Length" for total no elements in all dimensions.".getlength(int x)" gets total elements in dimension x(int)
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What is a read only object? e. g.static readonly object padlock = new object();
sbehera02
- Dec 14th, 2006
A read only member is like a constant in that it represents an unchanging value. The difference is that a readonly member can be initialized at runtime, in a constructor as well being able to be initi...
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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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Implicit Object
What is an Implicit Object?
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Hash Code
What is meant by Hash Code?
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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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Threading
How does the main thread know of errors in child thread?
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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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Dynamic Interface Implementation
How to implement an interface to a existing class at runtime?
C# Interview Questions
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