ASP.NET System.Web

ASP.NET > System.Web

System.Web contains classes and interfaces that enable browser-server communication.

• HttpResponse
• HttpCookie
• Web Controls

Rss Feed Reader Vb.net Example

VB.NET > XML > Rss Feed Reader






Example

 Dim url As String = "http://rss.cnn.com/rss/cnn_latest.rss"

        Dim rssFeed As HttpWebRequest = DirectCast(WebRequest.Create(url), HttpWebRequest)

        Dim response = rssFeed.GetResponse()

        Dim rssStream = response.GetResponseStream()

        Dim rssDoc As New XmlDocument()

        rssDoc.Load(rssStream)

        Dim rssItems As XmlNodeList = rssDoc.SelectNodes("rss/channel/item")

        Dim i As Integer = 0

        Dim dt As DataTable = New DataTable("table")

        dt.Columns.Add("title", Type.GetType("System.String"))

        dt.Columns.Add("link", Type.GetType("System.String"))

        While i < rssItems.Count

            Dim node As XmlNode = rssItems.Item(i).SelectSingleNode("title")

            Dim title As String

            Dim link As String

            If node IsNot Nothing Then

                title = node.InnerText

            Else

                title = ""

            End If

            node = rssItems.Item(i).SelectSingleNode("link")

            If node IsNot Nothing Then

                link = node.InnerText

            Else

                link = ""

            End If

            Dim dr As DataRow = dt.NewRow()

            dr("title") = title

            dr("link") = link

            dt.Rows.Add(dr)

            i += 1

        End While

        DataGridView1.DataSource = dt

#Region Directive Visual Basic Example

Visual Basic > Directives > #Region

Collapses and hides sections of code.

Example:

Public Class Form1

#Region "Person"

    Public Class Person

    End Class

#End Region

    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load

    End Sub

End Class

Read XMLTYPE Oracle C#

C# > Oracle.DataAccess > Read XMLTYPE 

An OracleXmlType object represents an Oracle XMLType instance.

Example:

OracleConnection con = new OracleConnection() ;

con.ConnectionString = "Data Source=sid; User ID=xx; Password=xx; enlist=false; ";

con.Open();

OracleCommand xmlCmd = new OracleCommand();

xmlCmd.CommandText = "select xml from table ";

xmlCmd.Connection = con;

OracleDataReader poReader = xmlCmd.ExecuteReader();

OracleXmlType poXml;

while (poReader.Read())

{

     poXml = poReader.GetOracleXmlType(0);    

}

con.Close();

c# GuidAttribute Example

C# > InteropServices >  GuidAttribute 

Supplies an explicit Guid when an automatic GUID is undesirable.

When you write an application to be used as COM you have 
to give a unique name. In this case you need to apply GUID attribute.

Example

Class that is exported to COM with a fixed GUID

[GuidAttribute("bd2d60fa-8e40-4d06-ad6f-8760983efe33")]

public class ExposedToComClass

{

          

}

Get all services C#

C# > ServiceProcess > Service Controller

It is a Windows service that allows you to connect to a service.

You can manipulate it or get information about it.

Example:

Get list of all services

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.ServiceProcess;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

namespace WindowsFormsApplication1

{

    public class clsService

    {

        public string Name { get; set; }

        public string Type { get; set; }

        public string Status { get; set; }

    }

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        private void Form1_Load(object sender, EventArgs e)

        {

            ServiceController[] scServices;

            scServices = ServiceController.GetServices();

            List<clsService> lcs = new List<clsService>();

            foreach (ServiceController sc in scServices)

            {

                clsService cs = new clsService();

                cs.Name = sc.ServiceName;

                cs.Type = sc.ServiceType.ToString();

                cs.Status = sc.Status.ToString();

               

                lcs.Add(cs);

            }

            dgv.DataSource =lcs ;

        }

    }

}

Linq to SQL equivalent to TOP

C# > LINQ > Take

Take returns the first specified number of elements.

Example

Linq to SQL equivalent to TOP

var query = from q in dc.Queries.OrderBy(f => f.name).Take(10)