problem updating datagridview

[tejas_ch]

I am newbie to Vb.net. and getting trouble in showing received data onto datagridview control.I m writing a program to receive data from serial device and to show it on datagridview. But I m able to show only 1st data next data is not updated on DGV.

sample of my code is given below

     Try
            list.Add(New setup_Dgv(parametersData(0), parametersData(1), parametersData(2), parametersData(3)))
            dgv1.DataSource = list
            dgv1.Refresh()
        Catch ex As Exception
            MsgBox(ex.Message)
        End Try

please help me out in this
thx in advance

Tejas