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How do you add objects to hashtable
A) With Add methodB) With insert MethodC) With = operator
Kal_CSharp
- Jan 16th, 2008
See the example here:Hashtable ht = new Hashtable(); ht.Add(0, "Kals");ht.Add(1, "Kal"); (or)ht[0] = "ABC"; ht[1] = "XYZ";
Ashish
- Feb 5th, 2007
Object in the Hash table can be add with the add method as well as with "=" also.Hashtable h =new Hash Table()h.add(Key,Value)orh(Key)=valueThanks
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How do you refer parent classes in C#
A) SuperB) ThisC) Base
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How to implement multiple inheritence in C#
A) Using InterfaceB) Using Abstract classC) Using DelegatesD) Using Events
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How can you sort the elements of the array in descending order
A) Sort methodsB) Reverse methodsC) By calling Sort and then Reverse methodsD) Can’t sort in descending
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Editorial / Best Answer
Answered by: Prakhar
- Apr 12th, 2006
int[] arr = new int[3];
arr[0] = 4;
arr[1] = 1;
arr[2] = 5;Array.Sort(arr);
Array.Reverse(arr);rfb99
- Dec 16th, 2011
It is far more elegant and efficient to do something like
Array.Sort(arr, delegate(int x, int y) { return y.CompareTo(x); }); -
Where we can use DLL made in C#.Net
We can use the .net DLLs only in the applications supporting .NET.
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We have a dataset with one thousand records. Now we bind it to a datagrid. Now the question is suppose we have modified only three records in datagrid then how to update these three records in dataset. We have a single button to update the records
Max Headroom
- Jun 13th, 2008
Use the RowState property of the DataTable in the DataSet that the grid is bound to where RowState is Modified. You can do this in a number of ways, if you do a Select on the DataTable you can pass Ro...
manish sinha
- Jun 29th, 2007
Use dataset.GetChanges() method to return a modified copy of the dataset. This dataset will have only 3 records, modified ones.
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What are public, private and static constructors and differences between them?
Obiageligeorge
- Aug 23rd, 2011
A public constructor is accessible anywhere in the application
A private constructor is restricted to the class within the application
Static constructor give access to the data without necessarily creating an object classmd.shahidkamal
- Aug 22nd, 2011
Constructor are used for creating an object and returning a reference of the object. so whenever we write class1 obj=new class1(); Public Constructor The new Class1() is actually calling a public ze...
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What are multiple delegates?Can 2 delegates in a class can refer to a same method?
nikhilrawat23
- May 27th, 2008
multiple delegates and multicast delegates both are diffrent terms with diffrent aspects.delegate having one property that it could have multiple delegates in it.it means single delegates contain mult...
sajeesh
- Oct 17th, 2007
Multi cast delegates means a delegate can hold more than one methods but not vice versa.
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Only a 'Static' method can be called using delegate - True / False? Give Reason
Naveen Shivanadri
- Sep 18th, 2016
Using delegate, we can execute static method as well as instance method. By binding a method with delegate, we will use the instance if the method is instance method else method name if the method is static.
Naveen -
Abstract classes and virtual methods
Abstract classes can be overridden by virtual methods (true, false)
PeterVH
- Aug 19th, 2011
Hello Raj, you override methods, not classes. So, guessing you mean abstract methods. The overriding method can NEVER be virtual, but by using the "new" keyword you can *replace* the abstract method...
mahmood pasha
- Jul 1st, 2008
It is designed to act as derived class. the class , which contain more virtual function is called an abstract class. and it cannot be create as an object, and it is similar to Interface
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Variable Declaration and Assignment
What is difference between these two statement? if variable is declared and assign value in following two waysString sValue = (String)GridView1.DataKeys[GridView1.SelectedIndex].Value;String sValue = GridView1.DataKeys[GridView1.SelectedIndex].Value.ToString();
gispadhu
- Aug 19th, 2010
The first statement can handle null values whereas the second statement throws an exception.
hdkhanna
- May 18th, 2010
First statement:String sValue = (String)GridView1.DataKeys[GridView1.SelectedIndex].Value;The above statement uses type casting (explicit) to convert the value to string. Second statement:String sValu...
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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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Advantage of avl tree over binary search tree.
What is advantage using avl tree instead of using binary search tree ?
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Exception Handling
what is the necessary for "throws" and "throw" in exception handling??
Even Though the exception has been thrown automatically and being handled by try and catch block..
Suresh Jayaraman
- Sep 23rd, 2011
if we have different layers like Dataaccess layer,Business layer ,Presentation layer. The error is in DataAccess layer,that error should come to presentation layer and we can show that error in messa...
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If a base class has a bunch of overloaded constructors, and an inherited class has another bunch of overloaded constructors, can you enforce a call from an inherited constructor to an arbitrary base constructor?
Yes, just place a colon, and then keyword base (parameter list to invoke the appropriate constructor) in the overloaded constructor definition inside the inherited class.
poovarasan
- Jan 20th, 2021
Use keyword base in the overloaded constructor definition inside the inherited class
chintan.desai
- Aug 7th, 2009
Just use keyword base(<<list of parameters>>) at the first line of code in respective derive class constructor.Example:Class A{ public A(string s) { } public A(int i, s...
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String is an
Skill/Topic: BeginnerA) object typeB) reference type
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The base class Arrray belongs to the mamespace
Skill/Topic: IntermediateA) GlobalTypeB) ArraysC) System
Rajesh.A
- Apr 2nd, 2007
using System.Array.Tostring()
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There can me more than 1 Main() functions in a C# program
Skill/Topic: IntermediateA) YesB) NoExplanation: While compiling we can specify which Main() function to start in
shyinsi
- Jan 19th, 2009
Yes , While Compiling we can specify which main to use by going to properties and setting the startup object.
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What is late binding and early binding? What is the benefits and disadvantages of using them?
Devender Thadkapalli
- Nov 28th, 2011
Early binding is better. You can make your objects strongly type and resolve the errors if any at compile time instead of runtime
Suresh Jayaraman
- Sep 30th, 2011
The polymorphism is achieved by early binding and late binding Early Binding: Compiler bind the objects to methods at the compile time.This is called early binding or static binding.Function overloa...
C# Interview Questions
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