Computer Programming

Sunday, December 28, 2014

New operator is used to create a new object of an existing class and associate the object with a variable that names it. Basically new operator instantiates a class by allocating memory for a new object and returning reference to that memory.

Every class needs an object to use its member and methods by other classes. Programmer have to create that object using new operator to use functionality provided by that class. Following is the syntax to create new object of an existing class:

Class_variable =new Class_Name();

This syntax basically describes some points about new operator as below:

Allocates memory to class_variable for new object of class.
It invokes object constructor.
Requires only single postfix argument which calls to constructor.
Returns reference to memory which is usually assigned to variable of appropriate type.

Following statement will create an object of city class and allocate memory to this newly created object:

City metro;

metro = new City();

The equivalent code for the above statement that can be written in single line is:

City metro = new City();

So new operator does two things overall i.e. it first allocates memory somewhere to hold an instance of the type, and then calls a constructor to initialize an instance of the type in that newly allocated memory.

After creating new object for a class, that object can use all the members and methods defined in that class. You can assign all the properties for that class and operate available or new functions on those properties.

Friday, December 26, 2014

ASP.NET

December 26, 2014

TextMode property of TextBox in ASP.NET

In visual studio 2010 you can assign only three values to the TextMode property , Those values are SingleLine , MultiLine and Password. But in visual studio 2012 you can set lots of value to the TextMode property Those values are SingleLine , MultiLine, Password, Email,Date , DateTime,URl etc All values are given below diagram.

Now all values we are using one by one :

MultiLine : In MultiLine TextBox you can take multiple rows but in single line TextBox you can take only single row. MultiLine TextBox is used where you need multiple rows like address of person.

Lets take an example of MultiLine TextBox . Drag one TextBox control to the design window and set MultiLine to TextMode property.

<%@ Page Language="C#" %>

<!DOCTYPE html>

<script runat="server">

</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>

</div>
<asp:TextBox ID="TextBox1" runat="server" TextMode="MultiLine" Width="213px"></asp:TextBox>
<br />
<asp:Button ID="Button1" runat="server" Text="Button" />
</form>
</body>
</html>

Output

SingleLine TextBox : In SingleLine TextBox You can take only single row means your TextBox does not support enter key. Lets take an example of SingleLine TextBox.

<%@ Page Language="C#" %>

<!DOCTYPE html>

<script runat="server">

</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>

</div>
<asp:TextBox ID="TextBox1" runat="server" Width="213px"></asp:TextBox>
<br />
<asp:Button ID="Button1" runat="server" Text="Button" />
</form>
</body>
</html>

Password TextBox : In password TextBox your input character will change in circular filled disc or circle.

normally password TextBox is used where you need security. Lets take an example

<%@ Page Language="C#" %>

<!DOCTYPE html>

<script runat="server">

</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>

</div>
<asp:TextBox ID="TextBox1" runat="server" TextMode="Password" Width="213px"></asp:TextBox>
<br />
<asp:Button ID="Button1" runat="server" Text="Button" />
</form>
</body>
</html>

Output

Email TextBox : You can set TextMode property is email in visual studio 2012. HTML5 gives a new functionality to the web page such as email validation . you don't required expression validator for email validation . lets take an example of email validation feature in HTML5 .

<%@ Page Language="C#" %>

<!DOCTYPE html>

<script runat="server">

</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>

</div>
<asp:TextBox ID="TextBox1" runat="server" TextMode="Email" Width="213px"></asp:TextBox>
<br />
<asp:Button ID="Button1" runat="server" Text="Button" />
</form>
</body>
</html>

Output

Url : TextMode property is set to url then you will assign url to the TextBox. Its also a validator ,

line of code

<asp:TextBox ID="TextBox1" runat="server" TextMode="Url" Width="213px"></asp:TextBox>

Output

Monday, December 22, 2014

ASP.NET

December 22, 2014

SiteMap Path example in ASP.NET

Using the SiteMap Path class you can navigate a website. It displays a set of Text or images Hyperlinks. Inheritance hierarchy of SiteMapPath class are:
System.Object
System.Web.UI.Control
System.Web.UI.WebControls.WebControl
System.Web.UI.WebControls.CompositeControl
System.Web.UI.WebControls.SiteMapPath

Lets take an simple example of SiteMap Path

To create Web.Sitemap, right click the website name. A context menu appears. Select the Add New Item option from the context menu. The Add New Item dialog box appear. Select Site Map from the option available. This will create a new web.sitemap file in the website.

The Web.sitemap file consists of navigational details for an application. You can set the title, URL, and other information for each page by using the Web.sitemap file. code, copy and paste into your sitemap file.

Article : How to use Menu Control in ASP.NET

Video : A simple video contain how to use menu and sitemap file

<?xml version="1.0" encoding="utf-8" ?>
<siteMap xmlns="http://schemas.microsoft.com/AspNet/SiteMap-File-1.0" >
<siteMapNode url="~/Default.aspx" title="Home Page" description="">
<siteMapNode url="~/About.aspx" title="About" description="" />
<siteMapNode url="~/contact.aspx" title="contact us" description="" />
</siteMapNode>
</siteMap>

After that Add a master page and three web form(Default.aspx, About.aspx, contact.aspx) into the website folder. Here we take ASP.NET website , which is contain default asp.net template. After Completed your sitemap file you can add sitemap path control to the master page.

Note : Add SiteMap Path control into the master page after navigation control

Master page source code , where your sitemap path control exists

<%@ Master Language="C#" AutoEventWireup="true" CodeFile="Site.master.cs" Inherits="SiteMaster" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head runat="server">
<title></title>
<link href="~/Styles/Site.css" rel="stylesheet" type="text/css" />
<asp:ContentPlaceHolder ID="HeadContent" runat="server">
</asp:ContentPlaceHolder>
</head>
<body>
<form runat="server">
<div class="page">
<div class="header">
<div class="title">
<h1>
My ASP.NET Application
</h1>
</div>
<div class="loginDisplay">
<asp:LoginView ID="HeadLoginView" runat="server" EnableViewState="false">
<AnonymousTemplate>
[ <a href="~/Account/Login.aspx" ID="HeadLoginStatus" runat="server">Log In</a> ]
</AnonymousTemplate>
<LoggedInTemplate>
Welcome <span class="bold"><asp:LoginName ID="HeadLoginName" runat="server" /></span>!
[ <asp:LoginStatus ID="HeadLoginStatus" runat="server" LogoutAction="Redirect" LogoutText="Log Out" LogoutPageUrl="~/"/> ]
</LoggedInTemplate>
</asp:LoginView>
</div>
<div class="clear hideSkiplink">
<asp:Menu ID="NavigationMenu" runat="server" CssClass="menu" EnableViewState="false" IncludeStyleBlock="false" Orientation="Horizontal">
<Items>
<asp:MenuItem NavigateUrl="~/Default.aspx" Text="Home"/>
<asp:MenuItem NavigateUrl="~/About.aspx" Text="About"/>
</Items>
</asp:Menu>
</div>
</div>
<div class="main">
<asp:SiteMapPath ID="SiteMapPath2" runat="server">
</asp:SiteMapPath>
<br />
<asp:ContentPlaceHolder ID="MainContent" runat="server"/>
</div>
<div class="clear">
</div>
</div>
<div class="footer">

</div>
</form>
</body>
</html>

Code Generate the following output

Sunday, December 21, 2014

Turbo C

December 21, 2014

Program to find sum of even and odd numbers (using one for loop) in C

Instead of using two for loops as in the previous program, only one for loop can be used. Let us see how this can be achieved.

sum= 0;
/* To add all numbers */
for(i=1; i<=n; i++)
{
sum = sum+i;
}

It is easy to say that we are computing the sum of all the numbers from 1 to n. To add only even numbers or to add numbers, the code can be changed as shown below:

esum=0; /* To store sum of even numbers */
osum = 0; /* To store sum of odd numbers */

/* To generate the integer from 1 to n */

for(i=1; i<=n; i++)
{
if(i % 2 == 0) /* If even */
esum = esum + i; /* Add to even sum */
else
osum = osum + i;

}

Thus, after the control comes out of the for-loop, the variable esum contains the sum of even numbers and the variable osum contains the sum of odd numbers. The result can be printed using the following statements:

printf("Sum of even numbers = %d\n",esum);
printf("Sum of odd numbers = %d\n", osum);

The complete program is shown below:

Example : Program to add even numbers and odd numbers.
Program
#include<stdio.h>
main( )
{
int n, i, esum, osum;
printf("Enter the value of n:\n");
scanf("%d",&n);
/* Generate and print number from 1 to n */
printf("Integer from 1 to %d are \n",n);
for(i=1; i<=n;i++)
printf("%d",i);
printf("\n");
esum=0;
osum=0;

/* find sum of even and odd numbers */
for ( i=1; i<=n; i++)
{
if((i %2) == 0)
esum +=i; /* Add even numbers */
else
osum += i; /* Add odd numbers */

}
printf(" Sum of even numbers = %d\n",esum);
printf("Sum of odd numbers = %d\n",osum);
}

TRACING

Execution starts from here

Non-executable statement
Input
Enter the value of n:
6
Output 1
Integer from 1 to 6
1 2 3 4 5 6

Computations
e_sum = 0
o_sum = 0

i=1 2 3 4 5 6
e_sum = 0+2+4+6
= 12
o_sum= 0+1+3+5
= 9
Output 2

Sum of even numbers =12
Sum of odd numbers = 9

Saturday, December 20, 2014

ASP.NET

December 20, 2014

How to insert data into multiple table in ASP.NET

I have two table, such as complaint table and status table. Now, i want to add data in both table through same SqlCommand class instance. Now, first to prepare the Connection using SqlConnection class, after that design the query for first table after inserting the data, we can add data into other table.

You can check the complete.

Source Code

<table style="width:100%;">
<tr>
<td class="style3">
Complaint against To</td>
</tr>
<tr>
<td class="style1">
Name :                                        
<asp:TextBox ID="pname" runat="server" Height="24px" Width="245px"
ValidationGroup="cr"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator7" runat="server"
ControlToValidate="pname" ErrorMessage="Consumer Name Required" ForeColor="Red"
ValidationGroup="cr">*</asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td class="style1">
Business                                      
<asp:TextBox ID="pbusiness" runat="server" Height="24px" Width="245px"
ValidationGroup="cr"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator8" runat="server"
ControlToValidate="pbusiness" ErrorMessage="Consumer Name Required" ForeColor="Red"
ValidationGroup="cr">*</asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td class="style1">
Address                                      
<asp:TextBox ID="padd" runat="server" Height="61px" Width="248px"
TextMode="MultiLine" ValidationGroup="cr"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator9" runat="server"
ControlToValidate="padd" ErrorMessage="Consumer Name Required" ForeColor="Red"
ValidationGroup="cr">*</asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td class="style1">
Phone Number                            
<asp:TextBox ID="pnumber" runat="server" Height="24px" Width="245px"
ValidationGroup="cr"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator10" runat="server"
ControlToValidate="pnumber" ErrorMessage="Consumer Name Required" ForeColor="Red"
ValidationGroup="cr">*</asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td class="style1">
Faulty Proff                                  
<asp:TextBox ID="pfproff" runat="server" Height="24px" Width="245px"
ValidationGroup="cr"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator11" runat="server"
ControlToValidate="pfproff" ErrorMessage="Consumer Name Required" ForeColor="Red"
ValidationGroup="cr">*</asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td class="style1">
Faulty Proff Image                       
<asp:FileUpload ID="pproffimage" runat="server" />
</td>
</tr>
<tr>
<td class="style1">
Review Against                            
<asp:TextBox ID="preview" runat="server" Height="55px" Width="248px"
TextMode="MultiLine" ValidationGroup="cr"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator12" runat="server"
ControlToValidate="preview" ErrorMessage="Consumer Name Required" ForeColor="Red"
ValidationGroup="cr">*</asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td class="style1">
Fir Number (if any)                      
<asp:TextBox ID="pfir" runat="server" Height="24px" Width="245px"
ValidationGroup="cr"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator13" runat="server"
ControlToValidate="pfir" ErrorMessage="Consumer Name Required" ForeColor="Red"
ValidationGroup="cr">*</asp:RequiredFieldValidator>
</td>
</tr>
</table>
<p>
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Submit" />
</p>
<p>
<asp:Label ID="Label1" runat="server"></asp:Label>
</p>

<asp:ValidationSummary ID="ValidationSummary1" runat="server" ForeColor="Red"
ValidationGroup="cr" />

Design View Of Source code

Complete Business Logic Code

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Data.SqlClient;

using System.Configuration;

public partial class UserControl_complaint : System.Web.UI.UserControl

{

string savefile = string.Empty;

protected void Page_Load(object sender, EventArgs e)

{

}

protected void Button1_Click(object sender, EventArgs e)

{

string un=System.Guid.NewGuid ().ToString ();

if (pproffimage.HasFile)

{

pproffimage.SaveAs(Server.MapPath("~/images/" + pproffimage.FileName));

savefile = "~/images/" + pproffimage.FileName;

}

SqlConnection con = new SqlConnection();

con.ConnectionString = ConfigurationManager.ConnectionStrings["ConnectionString"].ToString();

con.Open();

SqlCommand cmd = new SqlCommand();

cmd.CommandText = "insert into complaint(Party_Name,Business,Address,Faulty_proff,Image,Review,Fir_Numer,Consumer_Id,date,uniquet) values(@cuoname,@cuofname,@cuodob,@cuoadd,@cuoimage,@cuophone,@cuoemail,@cuoph,@cuodate,@cuoun)";

cmd.Connection = con;

cmd.Parameters.AddWithValue("@cuoname",pname.Text);

cmd.Parameters.AddWithValue("@cuofname",pbusiness.Text);

cmd.Parameters.AddWithValue("@cuodob", padd.Text);

cmd.Parameters.AddWithValue("@cuoadd",pfproff .Text);

cmd.Parameters.AddWithValue("@cuoimage", savefile);

cmd.Parameters.AddWithValue("@cuophone",preview.Text);

cmd.Parameters.AddWithValue("@cuoemail", pfir .Text);

cmd.Parameters.AddWithValue("@cuoph",Session["cons_id"].ToString());

cmd.Parameters.AddWithValue("@cuodate", DateTime.Now.ToString ());

cmd.Parameters.AddWithValue("@cuoun", un);

int a = cmd.ExecuteNonQuery();

if (a > 0)

{

Label1.Text = "Data Inserted Sucessfully";

Label1.ForeColor = System.Drawing.Color.Green;

}

cmd.Parameters.Clear();

cmd.CommandText = "insert into status(status,Complaint_Id,consumer_id) values(@stname,@comid,@cunsid)";

cmd.Parameters.AddWithValue("@stname", "pending");

cmd.Parameters.AddWithValue("@comid",un);

cmd.Parameters.AddWithValue("@cunsid", Session["cons_id"].ToString());

cmd.ExecuteNonQuery();

}

Friday, December 19, 2014

java applet

December 19, 2014

How to run Applet in Netbean IDE

We are very familiar with java programming, when we come to applet programming then we need some resources like browsers, AppletViewer etc to run the applet code. When i run the applet code in command prompt using following command:

appletviewer filename.html

Applet viewer was not appear in windows 8.1. Then lastly i was decide that i shall install Netbean IDE for applet code.

import java.awt.*;
import java.applet.*;

public class design extends Applet
{
public void paint(Graphics g)
{
g.drawString("Hello World",50,100);
}
}

Now, copy this code and following some instructions which is given in the youtube video

Monday, December 15, 2014

ASP.NET

December 15, 2014

Prevention from SQL Injection attack in ASP.NET

In myPrevious article, we have already learn about SQL injection attack. We saw that if we use Text Box for retrieving data from the database then other queries also perform with the same database. So, Microsoft provide, Parameterized query for DML and DQL statements. Like
Replace this statement with the parameterized query

Direct Interface with TextBox (SQL Injection Attack Possible)

cmd.CommandText = "Select * from [TableName] where name='"+TextBox1.Text+"'";

Resolve this problem by the parameterized query

cmd.CommandText = "Select * from [TableName] where name=@name1";
cmd.Parameter.AddWithValue("@name1",TextBox1.Text);