Computer Programming

Tuesday, December 29, 2015

December 29, 2015

ASP.NET RSS Feeds Display | Get

In this article, I will show you, How to display RSS feeds on your website. Actually, RSS feeds is an XML file. In ASP.NET we can create it easily through generic handlers. By using XmlTextWriter class, we can create XML file and XmlTextReader class we can read XML file. In this article, I will use XmlTextReader class to read it.

Complete Source Code

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ReadRss.aspx.cs" Inherits="ReadRss" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Button ID="Button1" runat="server" Text="Read Rss" OnClick="Button1_Click" Width="163px" />
</div>
<asp:Repeater ID="Repeater1" runat="server">
<ItemTemplate>
<table>
<tr>
<td>
<asp:HyperLink ID="HyperLink1" runat="server" Text='<%# Eval("Title")%>'/>

</td>
</tr>
<tr>
<td>
<asp:Label ID="Label1" runat="server" Text='<%# Eval("Description") %>'/>

</td>
</tr>
</table>

</ItemTemplate>
</asp:Repeater>
</form>
</body>
</html>

CodeBehind File

using System;

using System.Collections.Generic;

using System.Data;

using System.Linq;

using System.Net;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Xml;

public partial class ReadRss : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

}

protected void Button1_Click(object sender, EventArgs e)

{

WebRequest request = WebRequest.Create("http://localhost:11973/Handler.ashx");

WebProxy proxy = new WebProxy("http://localhost:11973/Handler.ashx", true);

request.Proxy = proxy;

request.Timeout = 6000;

try

{

WebResponse response = request.GetResponse();

XmlTextReader xmlreader = new XmlTextReader(response.GetResponseStream());

DataSet ds = new DataSet();

ds.ReadXml(xmlreader);

Repeater1.DataSource = ds.Tables[2];

Repeater1.DataBind();

}

catch(Exception ex)

{

throw ex;

}

ASP.NET c#

December 29, 2015

ASP.NET : How to use image in error message in validation Control

If you are generating error message to the client side then you can use any type of validation in given ToolBox such as RequiredField validator , compare validator , custom validator etc. If you want to use Image for easy understand then you should insert image in Text property of the validation control.

<asp:RequiredFieldValidator ControlToValidate ="TextBox1" Text="<img width='40px' height='40px' src='error.jpg' />" ID="RequiredFieldValidator1" runat="server" ErrorMessage="RequiredFieldValidator"></asp:RequiredFieldValidator>

Here we have used HTML Image Tag inside Text property of control.
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>
<asp:TextBox ID="TextBox1" runat="server" Width="201px"></asp:TextBox>
<asp:RequiredFieldValidator ControlToValidate ="TextBox1" Text="<img width='40px' height='40px' src='error.jpg' />" ID="RequiredFieldValidator1" runat="server" ErrorMessage="RequiredFieldValidator"></asp:RequiredFieldValidator>

<asp:Button ID="Button1" runat="server" Text="Check RequiredField" />
</div>
</form>
</body>
</html>

Output

ASP.NET : How to use image in error message in validation Control

Monday, December 28, 2015

ASP.NET c#

December 28, 2015

ASP.NET Rss Feeds Create Database Table

In this Article, I will show you, How to create Rss feeds for your website article. Rss feed is a xml file so in this article, i will create a XML file and Data pick from database table. Rss contains differenet filds link channel , article title, article description, link of the article and many more things. By using Rss feeds we can improve our search engine results , i mean to say we can improve our SEO of the website.

How to Start it: First of all create two table in the database, These are the fields which are mentioned below. If you are the beginners then i will provide you a short video through this you can create both table easily.

Also i will provide you scripts of table, through these you can directly create table into your database.

CREATE TABLE [dbo].[Channel] (

[Id] INT IDENTITY (1, 1) NOT NULL,

[Title] NVARCHAR (100) NULL,

[Description] NVARCHAR (MAX) NULL,

[Link] NVARCHAR (100) NULL,

PRIMARY KEY CLUSTERED ([Id] ASC)

);

CREATE TABLE [dbo].[Feeds] (

[Id] UNIQUEIDENTIFIER NOT NULL,

[ChannelID] INT IDENTITY (1, 1) NOT NULL,

[Title] NVARCHAR (100) NULL,

[Description] NVARCHAR (MAX) NULL,

[Link] NVARCHAR (100) NULL,

[PDate] NVARCHAR (100) NULL,

PRIMARY KEY CLUSTERED ([ChannelID] ASC)

);

Add a Generic handler file, In it you have a ProcessRequest method. In This method you have to create your logic , I mean to say put your business logic code. You can copy the mentioned code and paste into your Generic Handler file.

<%@ WebHandler Language="C#" Class="Handler" %>

using System;

using System.Web;

using System.Xml;

using System.Data;

using System.Data.SqlClient;

public class Handler : IHttpHandler {

public void ProcessRequest (HttpContext context) {

createFeed(context, 1);

}

private void createFeed(HttpContext context,int chnlID)

{

using (XmlTextWriter writer=new XmlTextWriter(context.Response.OutputStream,System.Text.Encoding.UTF8))

{

DataTable dtable = GetTable("select * from [Channel] where Id=@channelID", chnlID);

writer.WriteStartDocument();

writer.WriteStartElement("Rss");

writer.WriteAttributeString("version", "1.0");

writer.WriteStartElement("Channel");

writer.WriteElementString("Title", dtable.Rows[0]["Title"].ToString());

writer.WriteElementString("Description", dtable.Rows[0]["Description"].ToString());

writer.WriteElementString("Link", dtable.Rows[0]["Link"].ToString());

//writer.WriteElementString("Title", dtable.Rows[0]["Title"].ToString());

dtable = GetTable("select * from [Feeds] where ChannelID= @channelID", chnlID);

foreach (DataRow item in dtable.Rows)

{

writer.WriteStartElement("Item");

writer.WriteElementString("Title", item["Title"].ToString());

writer.WriteElementString("Description", item["Description"].ToString());

writer.WriteElementString("Link", item["Link"].ToString());

writer.WriteElementString("Pub-Date", item["PDate"].ToString());

writer.WriteElementString("UniqueId",item["Id"].ToString());

writer.WriteEndElement();

}

writer.WriteEndElement();

writer.WriteEndDocument();

writer.Flush();

writer.Close();

}

private DataTable GetTable(string qry,int chnlID)

{

DataTable dt=new DataTable();

SqlConnection con = new SqlConnection();

con.ConnectionString=@"Data Source=(LocalDB)\v11.0;AttachDbFilename=|DataDirectory|\Database.mdf;Integrated Security=True";

con.Open();

SqlCommand cmd = new SqlCommand(qry, con);

cmd.Parameters.AddWithValue("@channelID", chnlID);

SqlDataAdapter da = new SqlDataAdapter(cmd);

da.Fill(dt);

return dt;

}

public bool IsReusable {

get {

return false;

}

Saturday, December 26, 2015

ASP.NET c#

December 26, 2015

How to change forecolor and backcolor dynamically of dropdownlist in ASP.NET

ForeColor and BackColor Change Dynamically

Using the color property you can change your appearance of the Control. Looks is matter for any website if you do something different for your visitor or registered user. Your website visitor want that no one text hidden on the website.
ForeColor : This is the TextColor which is appear in the DropDownlist .
BackColor : This is the BackGround color.
Example of the dynamically change forecolor and backcolor

<%@ Page Language="C#" %>
<!DOCTYPE html>
<script runat="server">
protected void Button1_Click(object sender, EventArgs e)
{
DropDownList1.ForeColor = System.Drawing.Color.White;

}
protected void Button2_Click(object sender, EventArgs e)
{
DropDownList1.BackColor = System.Drawing.Color.Black;
}
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<style type="text/css">
.auto-style1 {
font-size: large;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<div>

<span class="auto-style1"><strong>Change Fore color and backcolor of the dropdownlist
<br />
</strong>
<asp:DropDownList ID="DropDownList1" runat="server" Height="34px" Width="157px">
<asp:ListItem>Apple </asp:ListItem>
<asp:ListItem>Mango</asp:ListItem>
<asp:ListItem>Orange</asp:ListItem>
</asp:DropDownList>
<br />
<br />
</span>
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Change fore color" Width="112px" />
<br />
<br />
<asp:Button ID="Button2" runat="server" Text="Change back color" Width="112px" OnClick="Button2_Click" />
<br />

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

Output

How to change forecolor and backcolor dynamically of dropdownlist in ASP.NET

Friday, December 25, 2015

c# c# programming Windows Forms

December 25, 2015

Solve Application not responding problem

In this article, I will show you how to fix computer hanging problems. Generally, we all know about "Not Responding" problem. When processor takes time to execute the process then thats type of problem occurs. By using this article, I will resolve this issue.

Windows Form Design:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication5
{
public partial class Form1 : Form
{
private readonly SynchronizationContext synchronizationContext;
private DateTime previousTime = DateTime.Now;
public Form1()
{
InitializeComponent();
synchronizationContext = SynchronizationContext.Current;
}

private void button1_Click(object sender, EventArgs e)
{
for (var i = 0; i <= 1000000; i++)
{
label1.Text = @"Count : " + i;
}
}

private async void button2_Click(object sender, EventArgs e)
{
button1.Enabled = false;
button2.Enabled = false;
var count = 0;

await Task.Run(() =>
{
for (var i = 0; i <= 1000000; i++)
{
UpdateUI(i);
count = i;
}
});
label1.Text = @"Count : " + count;
button1.Enabled = true;
button1.Enabled = false;
}
public void UpdateUI(int value)
{
var timeNow = DateTime.Now;

//Here we only refresh our UI each 50 ms
if ((DateTime.Now - previousTime).Milliseconds <= 50) return;

//Send the update to our UI thread
synchronizationContext.Post(new SendOrPostCallback(o =>
{
label1.Text = @"Count : " + (int)o;
}), value);

previousTime = timeNow;
}
}
}

ASP.NET Bulleted List c# DOTNET SQL-SERVER

December 25, 2015

How to bind Bulleted List control in asp.net

Following some steps for binding bulleted list control using SqlDataSource

In this article, I will show you, How to bind BulletedList in ASP.NET. In this article, I will take SQL DataSource control to bind it. ASP.NET Provide inbuilt control to bind any other control like ListBox, ComboBox, BulletedList. After bind it, it will look like list of unordered list of HTML.Lets to Start how to bind it. I will Give you, video as well as code for this.

Step-1 : Open visual studio

Step-2: Click File-->New-->WebSite

Step-3: Right click on website name in solution explorer, Add-->Add new item

Step-4: Make Database table

Step-5: Drag Bulleted list from toolbox and drop on design window.

Step-6: Select Show smart tag of Bulleted list

Step-7: On Bulledted list task click choose data source link

Step-8: Select New DataSource from Data Source configuration wizard.

Step-9: Select SQL Database from Data Source Configuration wizard. and click ok button

Step-10 : Select existing database from configure data source.

Step-11 : Change Connection name according to you and click ok

Step-12 : Select table from name ,select table field name and press ok button

Step-13: Click test query button and finish the process

Step-14: Select a data field to display in the bulleted list.

Step-15: Select a data field for the value of the bulleted list. and press ok button

Run your application

Finally source of the code are:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" %>

<!DOCTYPE html>

</head>

<body>

<div>

<asp:BulletedList ID="BulletedList1" runat="server" DataSourceID="SqlDataSource1" DataTextField="Name " DataValueField="Url">

</asp:BulletedList>

<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:ConnectionString %>" SelectCommand="SELECT * FROM [mytab]"></asp:SqlDataSource>

</div>

</form>

</body>

</html>

Top Related Article

Tuesday, December 22, 2015

WPF

December 22, 2015

Example of Customized TabItem of TabControl in WPF

Customized Tab Item Example:

Tab Item is the item control of Tab control. In this article, I will show you, how to add images, TextBlock and any other control inside TabControl. Also I will show you how to move Tab Control's tabs using buttons like Pre, Next, Get Item of Selected tab. When we press Previous button then next tab move to previous button. Similarly for all buttons.

<Window x:Class="WpfApplication9.tabcon"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

Title="tabcon" Height="300" Width="300">

<Grid>

<!--<TabControl>

</TabItem>

</TabControl>-->

<Button Name="selectbutton" Click="selectbutton_Click" Height="36" Width="54">select</Button>

</StackPanel>

</TabItem>

<TabItem.Header>

</TabItem.Header>

</TabItem>

</TabControl>

</DockPanel>

</Grid>

</Window>

Code Behind

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

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.Shapes;

namespace WpfApplication9

{

/// <summary>

/// Interaction logic for tabcon.xaml

/// </summary>

public partial class tabcon : Window

{

public tabcon()

{

InitializeComponent();

}

private void prebutton_Click(object sender, RoutedEventArgs e)

{

int nindex = sample.SelectedIndex - 1;

if (nindex < 0)

nindex = sample.Items.Count - 1;

sample.SelectedIndex = nindex;

}

private void Nextbutton_Click(object sender, RoutedEventArgs e)

{

int nindex = sample.SelectedIndex + 1;

if (nindex >= sample.Items.Count)

nindex = 0;

sample.SelectedIndex = nindex;

}

private void selectbutton_Click(object sender, RoutedEventArgs e)

{

MessageBox.Show("Selected Tab is:" + (sample.SelectedItem as TabItem).Header);

}