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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...
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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
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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.
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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 ...
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What the difference between Process and thread?
Devender Thadkapalli
- Nov 28th, 2011
Thread is a Execution instruction. Threads cannot live without a process
George
- Aug 11th, 2011
Thread are not fully Isolated whereas Process are fully isolated from each other...
Thread share memory with other application while running in the same application whereas process will not share any memory.. -
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"
In a multilevel hierarchy how are the constructors are called
A) TopDownB) BottomUpC) None
Why multiple Inheritance is not possible in C#?
(Please do not answer like this-It is possible through Interfaces.)
Which statement is invalid with regards to Constant
A) They must be initialized when they are declaredB) The value of the constant must be computable at compile timeC) Constants are not staticD) Constant is a variable whose value can be changed through out it’s life time when it is static.
Elean0r
- May 25th, 2011
Statement D is definitely invalid. Statement C occupies a grey area, since:a) a const field will have the same value in each object of that class; so it appears to? have same effect as a static reado...
levteck
- Aug 16th, 2010
Straight out of MSDN:"The static modifier is not allowed in a constant declaration."The invalid statement is d)
How to clear screen using c# console application...?like clrscr() in c++..!
Anuj Malik
- Oct 5th, 2012
Console.Clear(); its work absolute in c# "c# using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace ConsoleApplication9 { class stud...
amreenkhader
- Jan 20th, 2012
To clear the screen we can use the clrscr() command followed by ; to clear the input given to the program
Which operator is used for TypeCasting
A) [ ]B) ( )C) TypeOf
Logan
- Mar 26th, 2015
B
C# sealed variables
I have taken a windows application and a button control in it.I want to declare a variable as a sealed and use that variable with in same class as we cannot use in other class. class test { public sealed int x = 5; public void abc() { MessageBox.Show(x.ToString()); } } class best :test { ...
Sivavt
- Mar 29th, 2012
Keyword sealed can be used with class declaration to prevent it from being sub-classed.
Keyword sealed can be used in method declaration to prevent it from being overridden.
Rajeeva
- Sep 4th, 2011
To restrict users from inheriting the class by sealing the class using "sealed" keyword i.e. no class can be drieved from a sealed class. both Class and Method can be sealed, in that case Method cannot be overridden.Any process can be divided into multiple
Skill/Topic: AdvancedA) ProgramsB) ThreadsC) Application domains
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LordAlex- Member Since Nov-2011 | Nov 5th, 2011
Application domains are typically created by runtime host( i.e. Windows process/program). Application domains provide an isolation boundary for security,.... .NET program is an Assembly loading into an Application domain. Threads are the operating system construct used by the common language runtime to execute code in Application domains. Therefore, for .NET, Process (runtime host) -> Application Domains -> Assemblies (.NET programs)-> Managed Threads.
Sivavt
- Mar 25th, 2012
App domains. This could be best understood by taking an example of a browser program. A browser may run multiple web applications simultaneously. All these could be run in separate app domains. So, i...
Divide Two Numbers Without Using Division and Modulus Operator
Write C# code to divide two numbers without using the division and modulus operator
Default Access Specifer
What is default access specifer of a class in C#? Is it internal or private?class foo{ int Var; }In the above code snippet. What is the default access specifier for the variable Var.
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phanish- Member Since Jul-2010 | Jul 16th, 2010
Default Access Specifier of a class is Internal and Default Access Specifier of Member Variable is Private
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