How to receive a char from PC serial port

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I have to receive a charecter sent form MCU to PC and I have to write a function to receive data in vb.net since I am a biginer in vb.net unable to code. I have googled and find the following code but this is for receiving and displaying on RichTextBox but I have to receive and assign it to a variable for further use. For which how to write a function. Please help me. Please give coding. Thank you.

Code:
Code vb.net - [expand]
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Private Sub SerialPort_DataReceived(ByVal sender As Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles SerialPort.DataReceived
        ReceivedText(SerialPort.ReadExisting())
    End Sub
    'Serial Port Receiving Code Ends Here ….
 
    'Serial Port Receiving Code(Invoke) Starts Here ….
    Private Sub ReceivedText(ByVal [text] As String)
        If Me.RichTextBox_rxdata.InvokeRequired Then
            Dim x As New SetTextCallback(AddressOf ReceivedText)
            Me.Invoke(x, New Object() {(text)})
        Else
            Me.RichTextBox_rxdata.Text &= [text]
        End If
    End Sub
 
Last edited by a moderator:

hi.. i ussually use "timer" to handle the incoming data. here is the example i can give. it not the real code.

Code: 
dim rx_data as string

Private Sub SerialPort_DataReceived()
rx_data = serialport1.readexisting
end sub

private sub timer1_tick
textbox1.text = rx_data
end sub
 

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