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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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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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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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C# Data Table Multiple Rows
You have multiple rows in C# data table and you have to save it in database using just one call, How will you do it?
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LordAlex- Member Since Nov-2011 | Nov 5th, 2011
In a typical multiple-tier implementation, the steps for creating and refreshing a DataSet, and in turn, updating the original data are to: 1. Build and fill each DataTable in a DataSet with data from a data source using a DataAdapter. 2. Change the data in individual DataTable objects by adding, updating, or deleting DataRow objects. 3. Invoke the GetChanges method to create a second DataSet that features only the changes to the data. 4. Call the Update method of the DataAdapter, passing the second DataSet as an argument. 5. Invoke the Merge method to merge the changes from the second DataSet into the first. 6. Invoke the AcceptChanges on the DataSet. Alternatively, invoke RejectChanges to cancel the changes.
Vasu
- Apr 10th, 2015
Yes
indrajith
- Jan 22nd, 2015
We can use SqlBulkCopy class here for example
Code- span style="color: #ff0000;">"dbtablename"
My switch statement works differently! Why?
C# does not support an explicit fall through for case blocks. The following code is not legal and will not compile in C#: switch(x){case 0:// do somethingcase 1:// do something in common with 0default:// do something in common with//0, 1 and everything elsebreak;}To achieve the same effect in C#, the code must be modified as shown below (notice how the control flows are explicit): class Test{public...
TheOutlander
- Aug 21st, 2010
Most of the other answers are right, but there is a caveat.Empty cases are allowed to fall through. However, the last case statement always needs a break - empty or not.
Which of the following is not a C# reserved keyword
A) IsB) AsC) InD) Of
pankajbanga
- Feb 25th, 2007
of is definitely the culprit is – checks object's compatibility with a given type. in – is used with foreach statement to iterate through items in a collection as ...
Object Oriented and Object Based Language
Explain What are Object Oriented Language and Object Based Language
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Aarthy_SP- Member Since Dec-2008 | Dec 10th, 2008
Any langauge based on encapsulation concpet and operations with the objects are called as Object Based language. Exmaple : VB is a Object based and not an Object oriented
Any langauge based on encapsulation concept and operations with the objects and also dealing with the inheritance and polymorphism are called as Object Oriented language. Exmaple : C++,C#Arpit Mandloi
- Nov 25th, 2015
Object Based languages: 1. Object-based language doesn't support all the features of OOPs like Polymorphism and Inheritance 2. Object-based language has in-built object like JavaScript has window obje...
Sivavt
- Mar 27th, 2012
Object based languages do not support inheritance & dynamic binding. Example, VB
What is the difference between const and static read-only?
The difference is that static read-only can be modified by the containing class, but const can never be modified and must be initialized to a compile time constant. To expand on the static read-only case a bit, the containing class can only modify it:-- in the variable declaration (through a variable initializer).-- in the static constructor (instance constructors if it's not static).
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Answered by: Eddie Quiroz
- Sep 3rd, 2005
A const must be initialized at the time of its creation. A readonly field can be assigned to once in the class constructor allowing you to pass in the value at run-time. Declaring fields as const protects both you and other programmers from accidentally changing the value of the field. Also note that with const fields, the compiler performs some optimization by not declaring any stack space for the field. The readonly keyword is similar to const, with two exceptions. First, the storage of a readonly field is the same as a regular read-write field, and thus there is no performance benefit. Secondly, readonly fields can be initialized in the constructor of the containing class.
md.shahidkamal
- Aug 16th, 2010
The Constant Fields are those which cannot be changed in runtime. Its value has to be assigned at declaration time. const string strMyString="Constant Data" ; //This is valid.Once declared now the val...
chandra_123
- Apr 7th, 2009
As static read-only variables must be initialized in the static constructor (static constructor cannot have parameters and it cannot be called manually), it is efficient to used const variables over static read-only variables if you know the values at creation of these variables.
Value Types are stored on the heap ..? Is it true/False ?
Skill/Topic: AdvancedA) TrueB) False
By declaring a base class function as virtual we allow the function to be overridden in subclasses
A) TrueB) FalseExplanation: If a function is declared virtual it needs to be overridden in subclass
Sivavt
- Mar 29th, 2012
It is not mandatory for a derived class to override the virtual base method. Nevertheless, derived class can opt to override the virtual base method to redefine the functionality.
Dinesh M Yadav
- Aug 28th, 2011
The answer is A) TRUE. If you declare a virtual method in a class , its not mandatory to override it in the sub class. However, In case of abstract class, the answer would be B) False since if you ...
Why strings are immutable?
Vasyliy Zvarydchuk
- Sep 6th, 2015
1) Much better for multi-threading programming
2) Simpler implementation simpler that String Builder.
3) Its impossible to make all operation upon string without changing it.Jeevan
- Apr 20th, 2012
People, please read the question before answering, don't just answer "Why" is the question - not "how".
Why inheritance is not supported by structures??
Vasyliy Zvarydchuk
- Sep 5th, 2015
Structures are inherited from System.ValueType abstract class on IL level and code Console.WriteLine(base.ToString()) inside structure will return name of structure type.
Mohammad Sharib Khan
- Jan 7th, 2015
Http://stackoverflow.com/questions/1222935/why-dont-structs-support-inheritance
Value of x
This is interview question,public void A() { int x; x = 8; x *= 4 + 8 / 2; } Given the above code, what is the value of "x"?options:- A) 3 B) 2 C)4 D) None
C# Program to test efficient coding
You have several instances of the following class (User). Provide a class with three methods:"AddUser" accepts a User instance as a parameter and add it to a collection."GetUser" accepts a UserID as a parameter and returns the corresponding User instance. It is important that this executes quickly as it will be used often."GetOrderedUserArray" returns an array of User instances ordered by UserID....
jankajg
- Sep 25th, 2010
@asaf122 - your method can be improved a bit by using list. Find even better by lambda expressions) here is howclass UserManager{private List list; internal List List{get { return list; }set { list va...
What is managed code?
Skill/Topic: IntermediateA) Code managed ouside the ILB) Code which can't be managed by the ILC) Code written in VB.NETD) Code to be compiled by IL
levteck
- Aug 16th, 2010
C) Code written in VB.NET is managed code.??If it was written in Java it would be considered unmanaged.? If it is not compilable into IL to run on CLR than it is unmananged code.
vidyajnath
- Jul 5th, 2010
Code that targets the Common Language Runtime, the foundation of the .NET Framework, is known as Managed Code; Code that does not target the Common Language Runtime is known as Unmanaged Code.
Who calls the main method ??
subramanyam1981
- Jan 28th, 2008
The CLR calls the main method. operating system has nothing to do with.
All .NET code have to be CLS compliant
Skill/Topic: IntermediateA) TrueB) False
Sivavt
- Mar 26th, 2012
Not required. If you want your code to be CLS complaint use the annotation CLScompliant(true)
Ravi Kumar
- Dec 3rd, 2011
False All .Net code need not be CLS compliant if you are going to write all modules using single .Net language. However, if you are going to use different .Net language for different modules then you...
What happens if we refer a variable which in not initialized in C#
A) Compiler throws warning messageB) Compiler throws error messageC) Compiles the application with out any problemExplanation: Variable needs to be initialized before use
John Jiang
- Jul 4th, 2008
There is no veriable in a class only fields or properties. when we say variables that means they are in a method. so it will throw a error!!!
If we have 2 interfaces, say Ix and Iy, and also we have one method in both interfaces with same signature. Now we have to inherit a class from both interfaces so how to access the method of interface Ix or that of Iy.
DilpreetSachdev
- Mar 2nd, 2007
I think, while answering this question people are missing on the simple OO concepts. When we inherit from an Interface say X and it has a method say do() , what you are saying is that any class...
swatias
- Dec 23rd, 2006
We can inherit the methods of lx & ly interfaces using lx.method() and ly.method().Reference: http://msdn2.microsoft.com/en-us/library/ms228387(VS.80).aspx
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