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Which attribute you generally find on top of main method
A) [assembly]B) [ STA ]C) [ STAThread ]
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The C# keyword int maps to which .NET type
A) System.Int16B) System.Int32C) System.Int64
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Can u create the instance for abstract classes
yunuskhan
- Mar 4th, 2009
We can create an instance of an abstract class.The below code is not working:sayHello is an abstract classObject o=System.Activator.CreateInstance(typeof(sayhello));
Gaurav
- Sep 26th, 2006
This is not working. Following is the code:using System;using System.Collections.Generic;using System.Text;namespace ConsoleApplication2{public abstract class sayhello{public void hello(){Console.Writ...
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Where are custom exceptions derived from?
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Output of int sqrt(volatile int *ptr){ return (*ptr**ptr);}
garanaveen
- Sep 25th, 2010
This question is an interview question which is asked to test the possible problems with the code if any.This function is supposed to calculate the square of the number pointed by ptr.As it is volatil...
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What is difference between dispose() & finalize() in c#?how database remotely connected?
udhakal
- Nov 25th, 2008
Dispose is called explicitly by the user whereas finalize is called by garbage collector when ever it assumes to be appropriate.usually we use dispose method to free resources of our custom classes. Dispose can be implemented by using IDISPOSABLE interface
saurabhd
- Jan 19th, 2007
Design Pattern : If your classes use unmanaged resources, you need to implement both Dispose & Finalize. Dispose() is called by user code, that is, the code that is using your class.Finalize/Destr...
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Find subString in String
Hi All,
I have written the below program to find the substring in the string. in case one word coming multiple time how to handle this situation ? the below program retuning -1 as position which is wrong.
cInput ("abhijit" , "jit")
public int FindSubString(string strSuper, string strSub)
{
char[] charSuper = strSuper.ToCharArray();
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What is the difference between Cast and Convert int i1 = 5;double d1 = i1 + 0.99;int i2 = (int)d1; //result is 5i2 = Convert.ToInt32(d1);//result is 6Why does cast and convert in above example have different results.
nikhilrawat23
- May 28th, 2008
convert internally call parse method for conversion implicitly. If we are using convert for conversion and the object is null than it will return 0 value while if we r using cast then it will give nul...
ChandimaP
- Sep 23rd, 2007
Convert will correctly converts a number from one format to another if possible.However, Cast ignores the encoding format of the data type. It deals directly with the encoded binary values of the data...
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What is ref parameter?What is Out parameter?What's the difference between these two?
Kuldeep Shishodia
- May 25th, 2010
Ref parameter are basically use to pass the variable as a reference to a function.OUT Parameter are used to send back the result to a calling function.
Sachin
- Aug 6th, 2007
Oops...The difference is that for a ref parameter, you have to assign a value before you call the function, while for OUT parameter, you dont have to assign a value, the calling function assumes that the called function would assign some value.
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How to Convert String to Integer without using any BuiltIn Functions ?
Pattiwack
- Nov 2nd, 2011
I tihnk they want to see if you can manually convert the string..."c# int nResult = 0; int nNeg = '-'; int nMin = '0'; int nMax = '9'; bool bNegate = false; for(int i =0; i < sStr...
latapaka
- Oct 14th, 2008
String test = "100"; int test1 = Convert.ToInt32(test); Console.Write(test1); Console.Read();
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Explain the advantages and limitations of using Aliases in C#?
LordAlex
- Nov 3rd, 2011
C# provides a set of predefined struct types called the simple types. The simple types are identified through reserved words, but these reserved words are simply aliases for predefined struct types in the System namespace.
{sbyte, byte, short, ushort, int, uint, long, ulong, and char}PeterVH
- Aug 19th, 2011
Well, it is needed if for some reason you have conflicting names. Silly example, but suppose you declare a variable with the name DateTime, and to be very funny (sarcasm) you also define a variable na...
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Can abstract classes have constructors? If the answer is yes, when do they get called?
vaneet
- Jun 3rd, 2008
Yes, the abstract classes can have constructors.But they can be run only by the subclasses of the abstract class
kiran prasad
- Dec 4th, 2007
Yes, Abstract classes have constructors.They are called when their derived class objects are instantiated..For more information, READ : Chapter 4, Professional C# 2005 by Wrox publications...Thanks.
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C# Error - Overload for method
I took a button in form.I have two classes emp and bonus.bonus class is inherited from emp class.If bonus is giving ie in dialog box if we select ‘Yes’ b ie bonus is added to sal and we get ts ie total sal along with eno.If bonus is not given ie in dialog box if we select ‘No’ we need to get only sal along with eno.The following pgm is working fine.class emp { private int...
bhanu supriya
- Jul 19th, 2010
Here you are passing parameters to the class itself...You have to pass the parameters to method.
sudhakarr.net
- Jul 11th, 2008
Hi aarruunnaa,You try this code, if it is useful for you send me reply otherwise ask me again dont hesitate class emp {public int eno,sal; public emp(){}public emp(int eno,int sal) {this.eno=eno;...
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Inheritance
What is the importance of inheritance in c# and why i used?
tllprmahesh
- Jan 9th, 2009
Classes are inherit from another class. Basically we are using OOPS for reusability, so inhertiance means deriving new class from base class, it occupies less memory.
nikhilrawat23
- May 27th, 2008
basically the main advantage of object orineted approach is code reusabilty which help us to improve performance by using less memory for computation.inharitance provide us code reusabilty by accessin...
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What is the use of fixed statement in c#?
asifdcsku
- Sep 12th, 2008
Fixed is used while doing type casting Fixed ensures that no exception will be thrown even if we are doing a wrong cast.
Vikas Yadav
- Apr 2nd, 2008
The fixed keyword is responsible for the pinning of managed objects(maanged by CLR). Pinning is the act of specifying to the GC that the object in question can’t be moved.Permitted in unsafe context only i.e wwhen u are using pointers in C#.
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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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Delegates and Generics in c#
What is the advantage of using delegates and Generics in c# .
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Editorial / Best Answer
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...
C# Interview Questions
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