free sms in asp.net?

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VB

ASP.NET

This is i tried many times but still i am not getting work you may see code here
With SerialPort1

.PortName = DropDownList1.Text
                .BaudRate = 9600
                .Parity = Parity.None
                .StopBits = StopBits.One
                .DataBits = 8
                .Handshake = Handshake.RequestToSend
                .DtrEnable = True
                .RtsEnable = True
                .NewLine = vbCrLf
                .Open()
                Label5.Text = ("Connected")

it shows o connected
With SerialPort1

.Write("AT" & vbCrLf)
                .Write("AT+CMGF=1" & vbCrLf)
                .Write("AT+CMGS=" & Chr(34) & txtnumber.Text & Chr(34) & vbCrLf)
                .Write(txtbody.Text & Chr(26))
                Label5.Text = ("sms Sent")

            End With
            'Else
            Label5.Text = ("ERROR MSG ON PORT")
            'End If
        Catch ex As Exception
            Label5.Text = (ex.Message)

        End Try

just it shows still serial port closed please help how i can do it asp.net