problem with format in datagridview

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DataGridView

formatting

Hello everybody ,

i have a problem with format , i need to change format of column when i get records from my bank(access) , i use code like this but didnt word :

da.SelectCommand = New OleDbCommand()

        With da.SelectCommand
            .Connection = my_con
            .CommandType = CommandType.Text
            .CommandText = "Select p_name,p_fname,p_mablagh from table1"

            If .Connection.State <> ConnectionState.Open Then
                .Connection.Open()
            End If
        End With

        Dim ds As New Database2DataSet
        da.Fill(ds.Table1)
        Me.DataGridView1.DataSource = ds.Table1
        my_con.Close()
        Me.DataGridView1.Columns(2).DefaultCellStyle.Format = "##,0"

this is my datagridview now :

[URL=http://img4up.com/viewer.php?file=47117885029305385819.jpg][IMG]http://img4up.com/up2/47117885029305385819_thumb.jpg[/IMG][/URL]

((value of column2 show like 12000 but i dont like it i want to show like 12,000))

but i want to change format of column2 like this pic :


[URL=http://img4up.com/viewer.php?file=81408470236125767939.jpg][IMG]http://img4up.com/up2/81408470236125767939_thumb.jpg[/IMG][/URL]

((value of column2 show like 12000 but i dont like it i want to show like 12,000))

*** i get record from bank

please help me