Delegates are reference types which allow indirect calls to 
methods .some single delegates can reference multiple 
methods

Delegate is a Function Pointer.It invokes methods. 
References to methods are wrapped in delegates.

Delegates are similar to function pointers in C C++,
Delegate objects hold references to functions.

Delgates are mainly used in  event handling

Delegate is nothing but a Function pointer,which stores the 
address of a method.
These of two types
1)simple delegate:which stores the address of the method.
2)multi cast delegate: which stored the address of multiple 
methods.

Generally Delegates are used for EVENT HANDLING and GENERIC 
ROUTINES

Delegate defines a reference type that can be used to 
encapsulate a method.Delegate is a function pointer in c++.

I. Delegate is  a Type-Safe and secure

DataView is Replica of a DataTable,which will be used for 
sorting,Filtering,searching and editing.

A DataView provides a dynamic view of data whose content, 
ordering, and membership reflect changes to the underlying 
DataTable as they occur.

Represents a databindable, customized view of a DataTable 
for sorting, filtering, searching, editing, and navigation. 
Namespace: System.Data
Assembly: System.Data (in system.data.dll)

RowFilter is a read/write property that gets and sets the 
expression used to filter the table.

Eg: DataView dv = dt.DefaultView;
    dv.RowFilter = "Country = 'USA'";

Protected Sub Sorting(ByVal sender As Object, ByVal e As 
GridViewSortEventArgs)
        Dim DESCENDING As String = "DESC"
        Dim ASCENDING As String = "ASC"

        Dim sortExpression As String = e.SortExpression
        If GridViewSortDirection = SortDirection.Ascending 
Then
            GridViewSortDirection = SortDirection.Descending
            SortGridView(sortExpression, DESCENDING)
        Else
            GridViewSortDirection = SortDirection.Ascending
            SortGridView(sortExpression, ASCENDING)
        End If
    End Sub
(Call this onsorting in datagrdi)
2)
Public Property GridViewSortDirection() As SortDirection
        Get
            If ViewState("sortDirection") Is Nothing Then
                ViewState("sortDirection") = 
SortDirection.Ascending
            End If
            Return CType(ViewState("sortDirection"), 
SortDirection)
        End Get
        Set(ByVal value As SortDirection)
            ViewState("sortDirection") = value
        End Set
    End Property
3) Private Sub SortGridView(ByVal sortExpression As String, 
ByVal direction As String)
        Try
            Dim dt As DataTable = BindData().Tables(0)
            Dim dv As New DataView(dt)
            dv.Sort = sortExpression + " " + direction
            gdvCamp.DataSource = dv
            gdvCamp.PageIndex = 0
            gdvCamp.DataBind()

        Catch ex As Exception
            Response.Write(ex.Message)
        End Try

    End Sub 'SortGridView 

  Bing the data like fallows
 Private Function BindData() As DataSet
   Binding Goes here which should returns dataset to above 
function
End FUnction

In a simple method,

DataSet ds = new DataSet();
// you must populate the dataset
DataTable dt = ds.tables[0];
DataView dv  = new DataView(dt);
dv.Sort = dt.Columns[0];
// This will sort first column in ascending
dv.Sort = dt.Columns[0] + " DESC";
// This will sort first column in descending

By setting "allow sorting" property of the datagrid to 
true we can sort the records in the data grid

DataSet : you can move forward\backward of the data.It can 
be Edited.It acts as a database after the connection is 
closed.

Reader :  It Just moves forward only.And cannot edit it is 
only for Read Only purpose.For this connection object will 
be there till u read all the values.

dataset is a disconnected architecture while a datareader 
is a connected architecture object. 

data reader is a faster than a dataset

1)Dataset works like a frontend database.
2)Dataset supports disconnected architecture.
3)Dataset is a class.
4)It is the collection of tables.
5)Hence dataadapter means it is interface between dataset 
and database.
6)Dataset is a bridge.
7)Dataset is constraint like(primary key,foreign 
key,relation).

Data set is Disconnected Architecture. This is place to 
store data that we retrive from data base(using Data 
Adapter). After Retrive data from data base we no need to 
maintain a connection with data base

Dataset is an Ado.Net object.It is an Inmemory 
representation of a database i.e it provides disconnected 
environment using DataAdapter.

Dataset is a fundamental object of ado.net.It provides a 
basis of manipulating relational data in disconnected mode.

Data set is passive contener of data.Dataset is an Ado.Net 
object.It is an Inmemory representation of a database .
Data set is fill by dataadapter using Fill method.
 data set work in disconnected mode.

Dispose method()

Garbage collectors removes

Yes

Example: 
class A
{
A(){} //Constructor.
~A(){} //Distructor.
.........
..........
}

i think it doesnt allow to use Destructor.

there is a method called Dispose() which automatically 
calls destructor

yes,C# allows destructor.

yes.

when a objects created by Constructor are removed by 
destructor

Yes and No,
C# supports destructors just to provide a familiar way fo 
destructing objects for C++ developers. even syntax also is 
same but internally its the dicpose method that does all 
the work. 

Even if you declare a destructor the compiler automatically 
translates a destructor into an override of the 
Object.Finalize() method. In other words, the compiler 
translates the following destructor:  

class Class1
{
~Class1(){}
}

Into the following code:

class Class1
{
Protected override void Finalize()
{
try{..}
finally { base.Finalize();}
}
}

I guess that makes things more clear.

No, I didnt think distructor is supported by C# as far as 
dispose() is concern it is used for clean up code like 
finalize the object is distroyed automatically by garbage 
collector

Desturctors are very much supported by c#. Internally a c# 
destructor is converted to a finalize method call.

yes c# allow destructures

Constructor is a method that is executed when an object is
created.

Constructor is a method which will be executed when an 
object is created. It is used to Intialize the 
object.constructors has the same name as the class 
name.constructors will take parameters.constructors doesnot 
return any value

The object of a class is called as Instance & the process is
called as Instantiation.

To access or to call a member of a class we need instance.

eg.

public class myClass
{
  public myClass()
  {
  }
  
  public string show()
  {
   return "Hello India!";
  }
}

To access method show(), we need instance of the class
myClass. And the code will be as:-
myClass obj_mc = new myClass()
string str=obj_mc.show();

Now str contains string value 'Hello India!'

Hope u have got the point.

instace is the way to access members(methods) in that
class,by this instance to invoke the methods.

C# Supports memory pointer where as VB.net dont

C# is Suitable for C,C++ Programmer

casting object type is easy in C# (object)

in vb.net Ctype(blah blah blah)

c#.net is more secure when compare to vb.net


if any dout plz mail me

C# supports two things which is not supported by VB.NET
1. Operator Overloading
2. Pointer

c# is case sencitive,vb.net is not case sencitive,c# 
statements is placed between braces but in vb,net in 
between end of itself(sub  .. end sub).

thank you.

1) In Interface we can give only declarations not 
definitions but in abstraction we can hv definitions also.
2) In an Abstraction we must hv at least one abstract  
function.
3) Abstraction can not be instantiate .
4) In Interfaces we can not assign access identifier.
5) A class can implement 2 interfaces but can inherit only 
one Abstract function.

interface:
 in interface,all methods must b abstract,by default all
members are PUBLIC,cant b implimented infact derived class
impliments its methods
interface can use multiple interface
abstract:
it is just like interface,not imolimented by itself,only
derived class can impliment abstract class or abstract
methods,abstract methods can b private unlike interface,cant
allow multiple inheritance

In Interface, all the member functions are abstract implicitly  
so it is imp. to define all fn. declared inside Interface.
Moreover, we cann't define a fn. or we cann't  declare any
member variable in an Interface. Also, we cann't declare or
define any non-abstract method in Interface.

In Abstract class, we can declare an abstract method as well
as we can also define a  non-abstract method. We can also
declare a variable member in abstract class.

In both the condition, declared abstract method is
implemented  out side the class i.e in derived class which
inherits Interface/Abstract class, whatever you have used.

Yes

no

yes

YES

yes

Yes

yes

yea

yes

C# - web programming,CLR..

C++ is OOPS based while C# is Component & OOPS Based..

Default access Specifier is Public in c++.
Default access Specifier is Private in c#.net.

c++:
1.  C++ code usually compiles to assembly language.
2. will allow multiple inheritence. eg. allows a method to
be overriden many times in subclasses (derived classes).

C#:
1. C# by contrast compiles to Intermediate language (IL),
which has some similarities to java byte code.
2. supports inheritence, but not multiple, only 1 override
per method/function/

C++ is platform independent i.e. it directly compiles the
code into executable file where as C# is platform dependent
bcoz. it compiles the code to intermediate language(IL) &
the IL is the paased to .NET framework which activates CLR.
The CLR converts these IL into executable file.

Navin, what you told is not correct. C++ is platform 
dependent where as C# not. MSIL code will run in any 
platform if CLR is running.
For e.g., if a CLR is developed for Linux(I think its 
there), the code which got compiled in Windows can be run 
there. 
But for C++, the .exe file created is very much dependent 
on the machine. For e.g., the Windows C++ .exe file can 
never be run in Linux.

c++ follows oops and support for multiple inheritence with 
direct executable file on platform whereas c# is oops and 
component based .net lang.and compiles into assembly

c++ was older version while c# is obtained by merging features of c++ and java

1.c++ supports Object oriented bt c# is purely object 
oriented....2.in c++ the main class is diffrent it is 
outside d class bt in c# the main class in inside d class..

C++ uses the "include" header files where as c# uses the 
namespaces,
C++ runs for assmebly languages
where as c# runs in .net framework,
Pointers can be used anywhere in c++
but in c# pointers are used only in unsafe mode.
C++ does not support the multiple inheritance,c# support 
mulutiple inheritance.

required field valodator is used to check where a browser
has entered a value in atextbox or not.

Hi,
We can add the code in page_load

If Me.RadioButton1.Checked = True Then
            Button1.CausesValidation = True
        Else
            If Me.RadioButton2.Checked = True Then
                Me.Button1.CausesValidation = False
            End If
        End If

Required Field Validator does not depend upon any server 
control either it is enable or disable.Means if radio 
button1 is enable and radiobutton2 is disable at same time 
then u press button then by default validation control 
fired also in vice-versa case

Set causes validation on the button to false. Add a custom 
javascript function to the onclick event of that button. In 
the javascript function check whether the radio button is 
checked or not then. If checked call ValidatorEnable
(regValidatorId, true) and then call Page_ClientValidate() 
function.

Required validator checks for TextBox empty or not..

so to solve this problem

RequiredField validator--->properties..>validationGroup:sbmt
Button                 --->properties..>validationGroup:sbmt

Set both radio buttons AutoPostBack property to true.

and following code in page_load:

 if (RadioButtonNo.Checked == true)
        {
            this.Button1.CausesValidation = false;
        }
        else
        {
            this.Button1.CausesValidation = true;
        }