datagrid problem

[vbdotnetboy]

I keep getting an error when trying to populate my datagrid. everytime it hits the line for the mapping name it throws a null reference exception??? what am i doing wrong?

Try
            Dim ds As New Data.DataSet
 
            Dim da As New OleDb.OleDbDataAdapter("select * from library_tbl", cn)
 
            da.Fill(ds)
            Me.DataGrid1.DataSource = ds
            With Me.DataGrid1.TableStyles
                With .Item("dgtsLibId")
                    .MappingName = "library_tbl"
                End With
            End With
 
        Catch ex As Exception
            MessageBox.Show(ex.ToString)
        End Try