-
What is the role of the DataReader class in ADO.NET connections?
It returns a read-only dataset from the data source when the command is executed.
Rahul Prashant Singh
- Oct 14th, 2007
DataReader Class represents a read-only and forward-only stream of data.An instance of this class is used to hold the data returned by executing the Select statement in the DBCommand object using Executereader() method of the DBCommand Class.
swag
- Dec 24th, 2005
When the command is executed it provides a read-only farward-only dataset from the datsource which requires a connection to be open.
-
How can you overload a method?
Different parameter data types, different number of parameters, different order of parameters.
learnasp
- Oct 11th, 2007
A method can be overloaded by having different parameters as in different type of parameters and well different number of parameters.Also, if the parameter types are different than you can also have d...
sahu
- Dec 12th, 2005
Ans:Different parameter data types, different number of parameters, different order of parameters
-
How is method overriding different from overloading?
When overriding, you change the method behavior for a derived class. Overloading simply involves having a method with the same name within the class.
learnasp
- Oct 11th, 2007
Overriding a method involves changing the business logic og the method, however the return type and parameters remain same. However in overloading a method you can have multiple methods with same name but different signatures.
sahu
- Jan 9th, 2006
Ans:Answer: When overriding, you change the method behavior for a derived class. Overloading simply involves having a method with the same name within the class. function checkf(form) { var f = document.form1;if (document.form1.cmt.value=='') { alert('Please enter the comment'); return false; }}
-
What is the difference between the Debug class and Trace class?
Documentation looks the same. Use Debug class for debug builds, use Trace class for both debug and release builds.
vaibhav Tyagi
- Oct 2nd, 2007
the Debug and the Trace classes are available in the Microsoft .NET Framework. You can use these classes to provide information about the performance of an application either during applicatio...
-
Is there a way of specifying which block or loop to break out of when working with nested loops?
The easiest way is to use goto: using System;class BreakExample {public static void Main(String[] args) {for(int i=0; i<3; i++) {Console.WriteLine("Pass {0}: ", i);for( int j=0 ; j<100 ; j++ ) {if ( j == 10) goto done;Console.WriteLine("{0} ", j);}Console.WriteLine("This will not print");}done:Console.WriteLine("Loops complete.");}}
jmruizsr
- Sep 18th, 2007
Yes, there are ways to break out of nested loops. Although GOTO is allowed in C#, it is normally a bad idea, bad style, and indication of lack of good software development foundation of those wh...
venkatesh
- Oct 13th, 2006
In java there is no goto operator.I think we should use label statement for that
-
Can you declare the override method static while the original method is non-static?
No, you cannot, the signature of the virtual method must remain the same, only the keyword virtual is changed to keyword override.
gptnitesh
- Sep 11th, 2007
No you cannot declare the override method static while original method is non-static, not even vice versa.
Rajesh Ravindran
- Sep 11th, 2007
No, Because the Overrirde method or Overriden method should have same access attribute, same return type, same argument etc. If it is not same it will throw compiler error.
-
-
What does Dispose method do with the connection object?
Deletes it from the memory.
rjempo
- Sep 9th, 2007
It is important to note that connection.Dispose() actually closes the connection first.Hence I believe it is the preferred method of destroying a connection. Given that one should really Dispose...
-
Why does my Windows application pop up a console window every time I run it?
Make sure that the target type set in the project properties setting is set to Windows Application, and not Console Application. If you're using the command line, compile with /target:winexe & not /target:exe.
-
I was trying to use an "out int" parameter in one of my functions. How should I declare the variable that I am passing to it?
You should declare the variable as an int, but when you pass it in you must specify it as 'out', like the following: int i;foo(out i);where foo is declared as follows: [return-type] foo(out int o) { }
-
X=X+1 is equivalent to
A) X++B) X+=1C) Both A & B
samiksc
- Jul 11th, 2007
X=x+1 is equivalent to x+=1 except that value of x is evaluated only once.x=x+1 is not equal to x++ (not always equal as mentioned in one of the earlier comments). If x++ is a standalone statement, the two have equal effect.
dotnetrocks
- Jun 21st, 2006
Performance wise both the approaches are similiar. BUt consider this statement. suppose some object obj has a variable in it as i. then, obj.1 = obj.i + 1In this case at the MSIL level u can see 2 dif...
-
A class type in C# is a value type
Skill/Topic: BeginnerA) YesB) NoExplanation: It is a reference type
-
Assemblies cannot be loaded side by side
A) TrueB) FalseExplanation: Assemblies can be loaded side by side
xingoflife
- Jun 24th, 2007
True.Assemblies can be loaded side by side. Different versions of same assemble can be used inside a single process.Source: Professional C # 2005. Wrox edition
toyash
- Mar 23rd, 2006
Ans : FalseThe question is " Assemblies cannot be loaded side by side " This mean its false .. you can load assemblies side by side.
-
What is the syntax for calling an overloaded constructor within a constructor (this() and constructorname() does not compile)?
The syntax for calling another constructor is as follows: class B{B(int i){ }}class C : B{C() : base(5) // call base constructor B(5){ }C(int i) : this() // call C(){ }public static void Main() {}}
-
How do I create a multilanguage, single-file assembly?
This is currently not supported by Visual Studio .NET.
ramesh
- Jun 18th, 2007
It is not possible
-
-
-
How does one compare strings in C#?
In the past, you had to call .ToString() on the strings when using the == or != operators to compare the strings' values. That will still work, but the C# compiler now automatically compares the values instead of the references when the == or != operators are used on string types. If you actually do want to compare references, it can be done as follows: if ((object) str1 == (object) str2) { ... }Here's...
Rana
- May 24th, 2007
You can use a.Equals(b) to compare and return a bool value where both a and b are strings.
sahu
- Jan 8th, 2006
Ans:The .NET Framework provides several methods to compare the values of strings.i am giving few methods nameLists of methodString.Compare:Compares the values of two strings. Returns an integer value....
-
-
How do you implement thread synchronization (Object.Wait, Notify,and CriticalSection) in C#?
You want the lock statement, which is the same as Monitor Enter/Exit: lock(obj) {// code}translates to: try {CriticalSection.Enter(obj);// code} finally {CriticalSection.Exit(obj);}
jaganmohan2
- Apr 18th, 2007
A thread is simply a separate stream of execution that takes place simultaneously with and independently of everything else that might be happening. A thread can synchronize itself with another thread...
sahu
- Jan 10th, 2006
ans:yes,it is right.lock statement, which is the same as Monitor Enter/Exit: lock(obj) {// code}translates to: try {CriticalSection.Enter(obj);// code} finally {CriticalSection.Exit(obj);}
C# Interview Questions
Ans