$(document).ready(function() {
$(“.watermark”).focus(function() {
if ($(this).val() == this.defaultValue)
{
$(this).val(“”);
}
}
);

$(“.watermark”).blur(function() {
if ($.trim($(this).val()) == “”)
{
$(this).val(this.defaultValue);
}
}
);
}
);

css for watermark
.watermark
{
color: #ccc;
}

input text for watermark using asp.net textbox control

Note: type=’U’ means the object type is for table

Below are some simple steps to configure JQuery in your ASP.NET Web Project:
Before using JQuery Code in ASP.NET, First we have to download library file from “http://code.google.com/p/jqueryjs/downloads/detail?name=jquery-1.2.6.js”.
Right Click your project in Solution Explorer and add new folder and named it as Scripts.
Right click and click on add existing item and browse to the file where you have downloaded jquery library file, select the file and click add.
Now you can use JQuery library by drag and drop the library file–jquery-1.2.6.js file from the Solution Explorer.

I have demonstrated a simple example of JQuery in ASP.NET. This example explore how to use JQuery to select and unselect all the checkboxes in ASP.NET CheckBoxList.
Copy and paste this code in aspx file:

$(document).ready(function() {
$(‘#chkAll’).click(
function() {
$(“INPUT[type='checkbox']“).attr(‘checked’, $(‘#chkAll’).is(‘:checked’));
});
});

Also copy this code in your cs file:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
cblist.Items.Add(new ListItem(“Items 1″,”Items 1″));
cblist.Items.Add(new ListItem(“Items 2″,”Items 2″));
cblist.Items.Add(new ListItem(“Items 3″,”Items 3″));
cblist.Items.Add(new ListItem(“Items 4″,”Items 4″));
cblist.Items.Add(new ListItem(“Items 5″,”Items 5″));
}
}

2)Create ASP.NET Web Application project.

3)Go into Toolbox, right click and choose Add Tab. Name it as Ajax Control Toolkit. Click on choose items and click on browse button. Then give the location of download file and find a folder SampleWebSite and go inside bin folder, then chose AjaxControlToolkit.dll and click ok.

4) After the third step, you can see the appearance of Ajax Control Toolkit and its components in Toolbox.

5) Now Enjoy the Ajax Control Toolkit.

Advantages of WPF

WPF has a number of advantages over WindowsForms. The following list shows the most important.

* Resolution independence
You specify the size of objects in inches not in pixels. When the screen resolution gets higher, objects just appear crispier but they stay the same size.

* Hardware acceleration
WPFs vector based rendering engine takes advantage of modern graphic cards. This makes the user interface incredibly fast and scaleable.

* Rich composition
WPF controls are highly composable. That means that you can put almost any control into another. This reduces the number custom controls dramatically.

* Templates and Styles
WPFs styling and templating capabilities allows it to entirely replace the look and feel of any controls.

* Documents
WPF has a built in support for complex documents with multi column layouts. It can natively read and write XPS documents.

* Multimedia Support
WPF has a built-in support for audio, video and images. You can play a video with a single line of XAML.

* 3D
With WPF you can create complex 3D scenes including materials with textures, meshes, cameras, lights, etc.

WPF application uses a markup language called as XAML (XML Application Markup Language) and this application can be deployed on the desktop or hosted in a web browser. Microsoft SilverLight is a web based subset of WPF.

Lets demonstrate in a simple program:

The below given is a simple XAMPL file—named it as Window1.xampl. This program creates a GUI which contains a listbox where certain items are listed and one button with text box to add item in a listbox and another button to delete a selected item of listbox.

<Window x:Class=”WPFExmp1.Window1″
xmlns=”http://schemas.microsoft.com/winfx/2006/xaml/presentation”
xmlns:x=”http://schemas.microsoft.com/winfx/2006/xaml”
Title=”Window1″ Height=”296″ Width=”389″>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width=”278*” />
<ColumnDefinition Width=”0*” />
</Grid.ColumnDefinitions>
<ListBox Height=”100″ HorizontalAlignment=”Left” Margin=”10,10,0,0″ Name=”listBox1″ VerticalAlignment=”Top” Width=”120″ >
<ListBoxItem Content=”Coffee”></ListBoxItem>
<ListBoxItem>Juice</ListBoxItem>
<ListBoxItem Content=”Tea”></ListBoxItem>
<ListBoxItem Content=”Juice”></ListBoxItem>
</ListBox>
<Button Height=”23″ Margin=”138,10,154,0″ Name=”button1″ VerticalAlignment=”Top” Click=”button1_Click”>Add item</Button>
<TextBox Height=”23″ HorizontalAlignment=”Right” Margin=”0,10,36,0″ Name=”textBox1″ VerticalAlignment=”Top” Width=”107″ />
<Button Height=”23″ Margin=”138,40.4,154,0″ Name=”button2″ VerticalAlignment=”Top” Click=”button2_Click”>Delete Item</Button>
</Grid>
</Window>

The code below is code behind code–named it as Window1.xampl.cs.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WPFExmp1
{
/// <summary>
/// Interaction logic for Window1.xaml
/// </summary>
public partial class Window1 : Window
{
public Window1()
{
InitializeComponent();
}

private void button1_Click(object sender, RoutedEventArgs e)
{
listBox1.Items.Add(textBox1.Text);
}

private void button2_Click(object sender, RoutedEventArgs e)
{
listBox1.Items.Remove(listBox1.SelectedItem);
}

}
}

http://www.microsoft.com/downloads/thankyou.aspx?familyId=25144c27-6514-4ad4-8bcb-e2e051416e03&displayLang=en

E.g. Server.Transfer(“abc.aspx”);

If you want to navigate into different server then you can’t use Server.Transfer.  That is,

Server.Transfer(“http://www.google.com/”); gives the error .

For this, we have to use Response.Redirect where there is roundtrip but it doesn’t preserve the information. It sends message to the browser saying it to move to different page.

So in this case, we can do ,

Response.Redirect(“abc.aspx”);

Response.Redirect(“http://www.google.com/”);

1. Delete hidden files Ravmon.exe, MDM.EXE SCVHOST.EXE, SCVVHOST.INI (C:/windows)

2. Find ravmon.exe, SCVHOST.EXE in regedit and delete all these values.

3. Change in –regedit:HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL

Create a D-Word: CheckedValue assign to 1 (if virus is infected the value is 0 so changed it to 1).

How to enable Folder Options Menu in Windows

Some virus disable the folder options so to get rid off such problem, we have to modify some key value in regedit.

1. Create a new D-Word Value named “NoFolderOptions” and set it to equal 0;

0 means Folder option enable in menu and 1 mean disable folder option in window menu.

The given D-Word is created in

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer

How to enable Windows Registry (regedit.exe)

1. Click run and typed gpedit.msc

2. Then it will open the window named Group Policy

3. Go to Administrative Templates of User Configuration (right side of the windows) and then go to System

4. Disable Prevent access to registry editing tools.

How to kill Folder.exe virus

1. Kill the SCVVHSOT.exe using process explorer

2. Uncheck SCVVHSOT.exe from msconfig>startup

3. Then delete the file named SCVVHSOT.exe which is inside in Windows and system32 folder of windows.

4. And then delete SCVVHSOT.exe using regedit.exe

How to enable Task Manager.

Some virus like folder.exe disables the Task Manager.

When we enter CTRL+ALT+DELETE it shows the message “Task Manager has been disabled by your administrator” rather than displaying the windows Task Manager.

To solve such problem,

a) The D-Word value named “DisableTaskMgr” is set to 0. If 1, it is disabled. The D-Word value is changed in the windows registry inside the following key:

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System

How to enable or disable Autorun.ini command.

If you disable Autorun, commands in the Autorun.inf file will be ignored.

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]
Enable:  “NoDriveTypeAutoRun” = “95 00 00 00″
Disable: “NoDriveTypeAutoRun” = “BD 00 00 00″ or 0x000000b1(177)

How to remove ntde1ect.com or sometimes named as ntde1 ect.com virus

ntde1ect.com is a virus that checked only “Do not show hidden files and folders” and also checked “Hide protected operating system files (Recommended)”.

The following steps are required to solve the problem:

1. Start the computer with safe mode
2. Search the hidden files and system files and delete files- ntde1ect.com
3. Also remove ntde1ect.com from regedit
4. Note ntde1ect.com virus is also related with avpo.exe virus which is inside system32 and delete avpo.exe and its dll file.
5. Remove avpo.exe from regedit
6. The infection is removed and now to show hidden files follow the next title

Some key points of Windows Registry Tutorial

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL

CheckedValue: 1

DefaultValue: 2

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\NOHIDDEN

CheckedValue: 2

DefaultValue: 2

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\SuperHidden

CheckedValue: 0

DefaultValue: 0

UncheckedValue: 1

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\HideFileExt

CheckedValue: 1

DefaultValue: 1

UncheckedValue: 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\DisableThumbCache

CheckedValue: 1

DefaultValue: 0

UncheckedValue: 0

To remove this problem, we have StringBuilder Class which is not immutable. So using this class, we can easily change the value on the same instance. That means it change the value on the same object.

Eg:

string str=”Hello “;
str+=”World”;
// The above example create two instance  –immutable
StringBuilder str=new StringBuilder(“Hello “);
str.Append(“World”);
//The above example create a single instance–not immutable