Read save data to Registry C# Example

C# > Win32 > RegistryKey 

RegistryKey represents a key-level node in the Windows registry

Example:

Save user name to registry

RegistryKey regKey = Microsoft.Win32.Registry.CurrentUser.OpenSubKey("MyProgram");

if (regKey == null)

  regKey = Microsoft.Win32.Registry.CurrentUser.CreateSubKey("MyProgram");

if (regKey.GetValue("User", "") == null)

{

  regKey.SetValue("User", txtUser.Text);

}

else

{

  if (txtUser.Text != regKey.GetValue("User", "").ToString())

  {

    regKey.SetValue("User", txtUser.Text);

  }

}

regKey.Close();

Multiple Filter DataGridView DataSource

C# > DataGridView > Multiple Filter

RowFilter gets or sets the expression used to filter.

Example:

Filter by code or description

string rowFilter = string.Format("[{0}] like '%{1}%'", "Code", txtSearch.Text);

rowFilter += string.Format(" OR [{0}] like '%{1}%'", "Description", txtSearch.Text);

(DataGridView1.DataSource as DataTable).DefaultView.RowFilter = rowFilter;

Handle click event in Button Column in DataGridView

C# > DataGridView > DataGridViewButtonColumn

Add DataGridViewButtonColumn to your DataGridView.

To handle button click use CellClickEvent.

Example

private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)

{

  if (e.ColumnIndex == dataGridView1.Columns["Browse"].Index && e.RowIndex >= 0)

  {

               

  }

}

Call Statement VB.NET Example

VB.NET > Statements > Call

Call transfers control to a function or dynamic-link library.

Call keyword is used when the called expression doesn't start with an identifier.

Example:

Class mClass

    Public Sub Method()

        MessageBox.Show("Call statement")

    End Sub

End Class

Public Class Form1

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

        Call New mClass().Method()

    End Sub

End Class

HttpResponse ASP.NET

ASP.NET > System.Web > HttpResponse 

Encapsulates HTTP response information from an ASP.NET application.

• IsClientConnected

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