update database with DataGridView

hi all
i work with vb.net 2005 and Access 2003
i have 2 table in databse( Orders and Order_Details )

table Orders fields=OrderID,custid,employeeid,OrderDate
table Order_Details fields=OrderDetailID,OrderID,ProductID,Quantity,UnitPrice
Relationships by OrderID between 2 table

i have a dataset that fill it with Order_Details filds .
then i fill datagirdview with this dataset and edit it.
finally i want to update the database but nothing happend.
please someone help me.
thanks

Code:

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Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Load_DataGridview()
    End Sub
    Private Sub Load_DataGridview()
        Dim CNN As OleDbConnection
        Dim DAP As OleDbDataAdapter
        Dim DS As DataSet
        Dim cnnstr As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|\db.mdb"
        Dim SqlStr As String = "SELECT Order_Details.OrderDetailID,Order_Details.OrderID, Order_Details.ProductID, Order_Details.Quantity, Order_Details.UnitPrice FROM Order_Details;"
        CNN = New OleDbConnection(cnnstr)
        DAP = New OleDbDataAdapter(SqlStr, cnnstr)
        DS = New DataSet
        DAP.Fill(DS, "Order_Details")
        DataGridView1.DataSource = DS.Tables("Order_Details")
        DAP.Dispose()

    End Sub

---

Code:

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Private Sub ActionUpdate()
        Dim intRowsAffected As Integer
        Dim CNN As OleDbConnection
        Dim Command As OleDb.OleDbCommand
        Dim cnnstr As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|\db.mdb"
        CNN = New OleDbConnection(cnnstr)
        Dim SqlStr As String = "UPDATE Order_Details SET Order_Details.ProductID = [@Product],Order_Details.Quantity = [@Quantity],Order_Details.UnitPrice=[@UnitPrice]WHERE Order_Details.OrderID=[@OrderID]AND Order_Details.OrderDetailID=[@OrderDetailID]"
        CNN.Open()
        Command = New OleDbCommand(SqlStr, CNN)
        Command.CommandType = CommandType.Text
        For i As Integer = 0 To DataGridView1.Rows.Count - 1
            Command.Parameters.Add("@Product", Data.OleDb.OleDbType.VarChar, 50).Value = DataGridView1.Rows(i).Cells(1).Value
            Command.Parameters.Add("@Quantity", Data.OleDb.OleDbType.VarChar, 50).Value = DataGridView1.Rows(i).Cells(2).Value
            Command.Parameters.Add("@UnitPrice", Data.OleDb.OleDbType.VarChar, 50).Value = DataGridView1.Rows(i).Cells(3).Value
            Command.Parameters.Add("@OrderID", Data.OleDb.OleDbType.VarChar, 50).Value = DataGridView1.Rows(i).Cells(0).Value
            Command.Parameters.Add("@OrderDetailID", Data.OleDb.OleDbType.VarChar, 50).Value = i + 1
            intRowsAffected = Command.ExecuteNonQuery()
        Next i
        CNN.Close()
        If intRowsAffected = 1 Then
            MsgBox("update")
        ElseIf intRowsAffected = 0 Then
            MsgBox("not update")
        End If

    End Sub

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