Hi thanks you friends I solved
OleDbCommand top = new OleDbCommand("UPDATE NewInvoice_1 SET "+
" Terms = "+ CBL_Terms.EditValue.ToString() +", "+
" InvoiceDate='" + CBL_Date.DateTime + "', "+
" OurQuote='" + TXE_OurQuote.Text + "', "+
" SalesPerson=" + CBL_Sales_Person.EditValue.ToString() + ", "+
" CustomerName=" + CBL_Customer_Name.EditValue.ToString() + ", "+
" OrderNumber='" + TXE_Order_Number.Text + "', "+
" InvoiceAddress='" + TXE_Invoice_Address.Text + "', "+
" DeliveryAddress='" + TXE_Delivery_Address.Text + "', "+
" WholeDiscountP=" + Convert.ToDecimal(TXE_FlatDiscountP.Text) + ", "+
" WholeDiscountA=" + Convert.ToDecimal(TXE_FlatDiscountA.Text) + ", "+
" ShippingP=" + Convert.ToDecimal(TXE_ShippingPercentage.Text) + ", "+
" ShippingA=" + Convert.ToDecimal(TXE_ShippingAmount.Text) + ", "+
" Price=" + Convert.ToDecimal(TXE_SubTotal.Text) + ", "+
" Discount=" + Convert.ToDecimal(TXE_Discount.Text) + ", "+
" Tax=" + Convert.ToDecimal(TXE_Tax.Text) + ", "+
" Shipping=" + Convert.ToDecimal(TXE_Shipping.Text) + ", "+
" GrandTotal=" + Convert.ToDecimal(TXE_GrandTotal.Text) + ", "+
" TaxforDisc=" + barCheckItem1.Checked + ", DiscountType='" + selectedItem + "', "+
" ShippingBy='" + TXE_Shipping_By.Text + "',ShipReferenceNo='" + TXE_Reference_No.Text + "', "+
" IsInsured=" + CBX_Is_Insured.Checked + ", Notes='" + TXE_Notes.Text + "', "+
" DueDate='" + CBL_DueDate.Text + "' "+
" WHERE InvoiceId=" + TXE_Unvisible.Text, conn);
top.ExecuteNonQuery();