For a clear explanation : http://www.codeproject.com/KB/cs/abstractsvsinterfaces.aspx

2. What is Delegates

Delegates are functional pointers. It just refer a method.

3. OverLoading Vs OverRiding

Overloading is about creating multiple methods with the same name, but different signatures, in the same scope.

Overriding is about changing the behavior of a certain method in the child class from the way it is behaving in the parent class.

4. Boxing & Unboxing

Boxing : Value type converted to reference type

OnBoxing : Referenc type converted to value type

int i = 1;
object obj = i;		// boxing
int j = (int) obj;	// unboxing

5. What is a partial class. Give an example?

A partial class is a class whose definition is present in 2 or more files..

using System;
namespace PartialClass
{
 public partial class User
 {
 public void Login()
 {
 Console.WriteLine("I am logging in ....");
 }
 }
 public partial class User
 {
 public void Logout()
 {
 Console.WriteLine("I am logging out..");
 }
 }
 public class Demo
 {
 public static void Main()
 {
 User userObject = new User();
 userObject .Login();
 userObject .Logout();
 }
 }

} 

A view is a virtual table that consists of columns from one or more tables. Though it is similar to a table, it is stored in the database

2. StoredProcedure Vs Dynamic Query

StoredProcedure – Precomplied

Dynamic Query – Compied each time when its executes

3. What is Cursor ?

A cursor is a set of rows together with a pointer that identifies a current row.

In other word, Cursor is a database object used by applications to manipulate data in a set on a row-by-row basis, its like recordset in the ASP and visual basic.

Typical syntax of cursor is :

DECLARE @fName varchar(50), @lName varchar(50)

DECLARE cursorName CURSOR -- Declare cursor

LOCAL SCROLL STATIC

FOR

Select firstName, lastName FROM myTable

OPEN cursorName -- open the cursor

FETCH NEXT FROM cursorName

   INTO @fName, @lName

   PRINT @fName + ' ' + @lName -- print the name

WHILE @@FETCH_STATUS = 0

BEGIN

   FETCH NEXT FROM cursorName

   INTO @fName, @lName

   PRINT @fName + ' ' + @lName -- print the name

END

CLOSE cursorName -- close the cursor

DEALLOCATE cursorName -- Deallocate the cursor

4. What is the result of following

Declare @datevalue datetime

Declare @intValue int

Set @intValue = 1

Set @datevalue = ’2009-08-08 04:55:55′

Select @datevalue + @intValue

Answer:

2009-08-09 04:55:55.000

So int Value here taken as no of days. if  Set @intValue = 24 means, result will be 2009-09-01 04:55:55.000

5. What is Trigger ?

Triggers are basically used to implement business rules. Triggers is also similar to stored procedures. The difference is that it can be activated when data is added or edited or deleted from a table in a database.

Init() – when the page is instantiated
Load() – when the page is loaded into server memory
PreRender() – the brief moment before the page is displayed to the user as HTML
Unload() – when page finishes loading.

2. While on page cycle where is the ViewState is available ?

After the Init() and before the Page_Load(), or OnLoad()

3. How to avoid the Validation for Cancel button ?

Set CausesValidation = “false” or by using ValidationGroup.

4. DataGrid Vs GridView

GridView – It has the advanced features paging and sorting can be implemented withour postback

DataGrid – Have to write code with postback !

5. Global.asax used for ?

used to implement application and session level events

6. Lifespan of ViewState

ViewState exist for the life of the current page which includes postbacks too ..

7. How to check all the checkboxes which available inside gridview ?

Client Side :

<asp:UpdatePanel ID="pnlUpdate" runat="server" UpdateMode="Conditional">
            <ContentTemplate>
                <div align="left">
                    <asp:Button ID="btnCheck" runat="server" Text="Check/Uncheck All" BorderStyle="Ridge" 
                        BackColor="#CCCCCC" ForeColor="#FFFFFF" onclick="btnCheck_Click" /> &nbsp;
                  
                </div>
                <br />
                <div>
                    <asp:GridView ID="gvCheck" runat="server" Width="100%" AutoGenerateColumns="false" AlternatingRowStyle-BackColor="#EEEEEE">
                        <Columns>
                            <asp:TemplateField>
                                <ItemTemplate>
                                    <asp:CheckBox runat="server" ID="RowLevelCheckBox" />
                                </ItemTemplate>
                            </asp:TemplateField>
                            <asp:BoundField DataField="Name" HeaderText="Name" />
                            <asp:BoundField DataField="DateValue" HeaderText="DateValue" />
                        </Columns>
                    </asp:GridView>
                </div>
            
            </ContentTemplate>
        </asp:UpdatePanel>

Server Side :

protected void btnCheck_Click(object sender, EventArgs e)

    {

        CheckChange();

    }

    private void CheckChange()

    {

        int nRowCount = gvCheck.Rows.Count;

        for (int nIndex = 0; nIndex < nRowCount; nIndex++)

        {

            CheckBox chkChange = (CheckBox)gvCheck.Rows[nIndex].FindControl("RowLevelCheckBox");

            if (chkChange != null)

            {

                if (chkChange.Checked)

                    chkChange.Checked = false;

                else

                    chkChange.Checked = true;

            }

        }

    }

8. What is AutoEventWireUp ?

AutoEventWireup is an attribute in Page directive. It’s a Boolean attribute which indicates whether the asp.net pages events (Page_Init, Page_Load , etc.,) are auto-wired.

9. How to generate row number in the grid ?

<asp:TemplateField>

<ItemTemplate>

<%# Container.DataItemIndex + 1 %>

</ItemTemplate>

</asp:TemplateField>

Main two things I feel about Google & Microsoft Virtual Earth Map.. I m not sure which one is best ..

Lets start your experience over these Map APIs.. About Pros & Cors !!!

Lets start our controversies !

Regards

Bala

Those who are looking for professional display of overlay images they can move with Lightbox concept.

Where we can use this ?

Just think as you have the list of the product images (Datalist,GridView or whatever it may be) as grid..
you can just place a small image for that grids. For best example think about shopping cart websites.

If you like to see the maximized view of the image , what will be your option..

For that type of cases we can use this lightbox..

To understand more clearly look at the followinglink :

http://www.huddletogether.com/projects/lightbox2/

Before that, you have to add the AjaxControlToolKit on your Web application……..

To Add AjaxControltoolkit Follow these :

Step 1: Visit this site http://ajaxcontroltoolkit.codeplex.com/Release/ProjectReleases.aspx?ReleaseId=27326#ReleaseFiles

Step 2: Click  AJAXControlToolkitBinary.zip , on this folder a dll is availble “AjaxControlToolkit.dll”

Step 3: Open your Visual Studio Web Application

Step 4: On the ToolBox, Just Right Click and Choose Add Tab. Make a name for that tab, for example type “AjaxControlToolKit”

Step 5: Right Click the partcular tab(AjaxControlToolKit) And choose “Choose Items”. Now you can see the popup to choose components. On .Net Framework Components tab click the browse button and map AjaxControltoolkit.dll where u have in the local system

Now all the components in the AjaxToolkit are available on your application.

Step 6: Register your AjaxToolkit on the top of the page

<%@ Register Assembly=”AjaxControlToolkit” Namespace=”AjaxControlToolkit” TagPrefix=”Ajax” %>

Now Start with the Slideshow,

On the Design Part place this…

<div id=”SlideShowPanel”>

<asp:UpdatePanel ID=”updateSlider” runat=”server” UpdateMode=”Conditional”>

<ContentTemplate>

<div id=”SlideShowHeader”>

Our valuable projects</div>

<div id=”Slider”>

<div style=”background-color: #FFFFFF;”>

<br />

<table width=”100%” cellpadding=”0″ cellspacing=”0″>

<tr>

<td align=”center” valign=”middle”>

<asp:ImageButton ID=”btnPrevious” ImageUrl=”~/Images/scroll_left.png” runat=”server” />

</td>

<td align=”center” valign=”middle”>

<div>

<asp:Image ID=”imgView” runat=”server” />

</div>

<div>

<asp:Label ID=”lblProject” runat=”server” Font-Bold=”true”></asp:Label>

</div>

<div>

<asp:Label ID=”lblDescription” runat=”server”></asp:Label>

</div>

</td>

<td align=”center” valign=”middle”>

<asp:ImageButton ID=”btnNext” runat=”server” ImageUrl=”~/Images/scroll_right.png” />

</td>

</tr>

</table>

<br />

</div>

</div>

<Ajax:SlideShowExtender ID=”SlidShowExtender1″ AutoPlay=”true” ImageTitleLabelID=”lblProject” Loop=”true” runat=” NextButtonID=”btnNext” PreviousButtonID=”btnPrevious” ImageDescriptionLabelID=”lblDescription” SlideShowServiceMethod=”GetSlides” TargetControlID=”imgView”>

</Ajax:SlideShowExtender>

</ContentTemplate>

</asp:UpdatePanel>

On the Server Write down these codings..

[System.Web.Services.WebMethod]

[System.Web.Script.Services.ScriptMethod]

public static AjaxControlToolkit.Slide[] GetSlides()

{

AjaxControlToolkit.Slide[] slides = new AjaxControlToolkit.Slide[3];

slides[0] = new AjaxControlToolkit.Slide(“Ongoing/101.jpg”, “Ongoing Project”, “Location : Location 1″);

slides[1] = new AjaxControlToolkit.Slide(“Completed/Elevation-rev.jpg”, “Completed Project”, “Location : Location 2″);

slides[2] = new AjaxControlToolkit.Slide(“Completed/Elevation.jpg”, “Completed Project”, “Location : Location 3″);

return (slides);

}

Just look at the design part we mentioned in Ajax:SlideShowExtender called SlideShowServiceMethod=”GetSlides”, which placed in the serverside. You can add n no of items(slide images) in GetSlides..

Check it and enjoy with AJAX..

Cheers,

Bala