How to use Serialport out of the sub

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Hai All,
I am developing one VB Application in VS 2010. I am using Serialport property for sending Quiries to GSM Modem through Micro USB Cable. While using of this serialport property out of this method, i got run time errors ... any one please tell me how to use this property out of this event in the same class.

Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
        Try
            Dim mySerialPort As New SerialPort(ComboBox1.Text)
            mySerialPort.BaudRate = 19200
            mySerialPort.Parity = Parity.None
            mySerialPort.StopBits = StopBits.One
            mySerialPort.DataBits = 8
            mySerialPort.Handshake = Handshake.None
            AddHandler mySerialPort.DataReceived, AddressOf DataReceivedHandler
            mySerialPort.Open()
            If mySerialPort.IsOpen = True Then
                'For i As Integer = 1 To 3
                '    mySerialPort.Write("AT+CMGR=" & i & vbCrLf)
                '    MsgBox("AT+CMGR=" & i & vbCrLf)
                'Next
                '    ComboBox1.Enabled = False
                mySerialPort.Write("AT+CMGL=" & Chr(34) & "REC UNREAD" & Chr(34) & vbCrLf)
            End If
            ToolStripStatusLabel1.Text = ToolStripStatusLabel1.Text & "   " & ComboBox1.Text & "," & "19200" & "," & "N" & "," & "1" & "," & "8" & "," & "N"
        Catch Ex As Exception
            MsgBox(Ex.Message)
        End Try
    End Sub

Posted 14-Dec-11 23:19pm

Himachandra

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Romain TAILLANDIER 16-Dec-11 2:38am

You have to start with some MSDN documentation ...
http://msdn.microsoft.com/fr-fr/library/system.io.ports.serialport.aspx

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Dave Kreskowiak · Answer 1 · 2011-12-15T04:32:00

You've got a serious design flaw in your app. You should have a seperate class that manages the connection of the serial port. You'd maintain a class-global instance of this class in your form, then just call methods in that class from your handlers that tell it how to manipulate the serial port.