i know some about vb.net programming and i'm interested in developing some software which is able to Get Data From Serial Port /parallel Port to my working form.

can somebody advice me ,how to start such kind of developing and what should i refere (web sites /e books) for this purpose.

Look at the System.IO.Ports namespace for the SerialPort class.

Here is an example from the MSDN library:

Imports System
Imports System.IO.Ports
Imports System.Threading

Public Class PortChat
    Shared _continue As Boolean
    Shared _serialPort As SerialPort

    Public Shared Sub Main()
        Dim name As String
        Dim message As String
        Dim sComparer As StringComparer = StringComparer.OrdinalIgnoreCase
        Dim readThread As Thread = New Thread(AddressOf Read)

        ' Create a new SerialPort object with default settings.
        _serialPort = New SerialPort()

        ' Allow the user to set the appropriate properties.
        _serialPort.PortName = SetPortName(_serialPort.PortName)
        _serialPort.BaudRate = SetPortBaudRate(_serialPort.BaudRate)
        _serialPort.Parity = SetPortParity(_serialPort.Parity)
        _serialPort.DataBits = SetPortDataBits(_serialPort.DataBits)
        _serialPort.StopBits = SetPortStopBits(_serialPort.StopBits)
        _serialPort.Handshake = SetPortHandshake(_serialPort.Handshake)

        ' Set the read/write timeouts
        _serialPort.ReadTimeout = 500
        _serialPort.WriteTimeout = 500

        _serialPort.Open()
        _continue = True
        readThread.Start()

        Console.Write("Name: ")
        name = Console.ReadLine()

        Console.WriteLine("Type QUIT to exit")

        While (_continue)
            message = Console.ReadLine()

            If sComparer.Equals("quit", message) Then
                _continue = False
            Else
                _serialPort.WriteLine( _
                    String.Format("<{0}>: {1}", name, message))
            End If
        end while

        readThread.Join()
        _serialPort.Close()
    End Sub

    Public Shared Sub Read()
        While (_continue)
            Try
                Dim message As String = _serialPort.ReadLine()
                Console.WriteLine(message)
            Catch ex As TimeoutException
                ' Do nothing
            End Try
        End While
    End Sub

    Public Shared Function SetPortName(ByVal defaultPortName As String) As String
        Dim newPortName As String

        Console.WriteLine("Available Ports:")
        Dim s As String
        For Each s In SerialPort.GetPortNames()
            Console.WriteLine("   {0}", s)
        Next s

        Console.Write("COM port({0}): ", defaultPortName)
        newPortName = Console.ReadLine()

        If newPortName = "" Then
            newPortName = defaultPortName
        End If
        Return newPortName
    End Function

    Public Shared Function SetPortBaudRate(ByVal defaultPortBaudRate As Integer) As Integer
        Dim newBaudRate As String

        Console.Write("Baud Rate({0}): ", defaultPortBaudRate)
        newBaudRate = Console.ReadLine()

        If newBaudRate = "" Then
            newBaudRate = defaultPortBaudRate.ToString()
        End If

        Return Integer.Parse(newBaudRate)
    End Function

    Public Shared Function SetPortParity(ByVal defaultPortParity As Parity) As Parity
        Dim newParity As String

        Console.WriteLine("Available Parity options:")
        Dim s As String
        For Each s In [Enum].GetNames(GetType(Parity))
            Console.WriteLine("   {0}", s)
        Next s

        Console.Write("Parity({0}):", defaultPortParity.ToString())
        newparity = Console.ReadLine()

        If newparity = "" Then
            newparity = defaultPortParity.ToString()
        End If

        Return CType([Enum].Parse(GetType(Parity), newParity), Parity)
    End Function

    Public Shared Function SetPortDataBits(ByVal defaultPortDataBits As Integer) As Integer
        Dim newDataBits As String

        Console.Write("Data Bits({0}): ", defaultPortDataBits)
        newDataBits = Console.ReadLine()

        If newDataBits = "" Then
            newDataBits = defaultPortDataBits.ToString()
        End If

        Return Integer.Parse(newDataBits)
    End Function

    Public Shared Function SetPortStopBits(ByVal defaultPortStopBits As StopBits) As StopBits
        Dim newStopBits As String

        Console.WriteLine("Available Stop Bits options:")
        Dim s As String
        For Each s In [Enum].GetNames(GetType(StopBits))
            Console.WriteLine("   {0}", s)
        Next s

        Console.Write("Stop Bits({0}):", defaultPortStopBits.ToString())
        newStopBits = Console.ReadLine()

        If newStopBits = "" Then
            newStopBits = defaultPortStopBits.ToString()
        End If

        Return CType([Enum].Parse(GetType(StopBits), newStopBits), StopBits)
    End Function

    Public Shared Function SetPortHandshake(ByVal defaultPortHandshake As Handshake) As Handshake
        Dim newHandshake As String

        Console.WriteLine("Available Handshake options:")
        Dim s As String
        For Each s In [Enum].GetNames(GetType(Handshake))
            Console.WriteLine("   {0}", s)
        Next s

        Console.Write("Stop Bits({0}):", defaultPortHandshake.ToString())
        newHandshake = Console.ReadLine()

        If newHandshake = "" Then
            newHandshake = defaultPortHandshake.ToString()
        End If

        Return CType([Enum].Parse(GetType(Handshake), newHandshake), Handshake)
    End Function
End Class

Full article:
http://msdn.microsoft.com/en-us/library/system.io.ports.serialport.aspx

You're welcome

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