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DataView.AllowNew does not work in Master/Detail after scrolling through Master records

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6162 Aug 2,2003 04:13 PM UTC Sep 8,2003 02:26 PM UTC WinForms 3
Tags: FAQ
Asked On August 2, 2003 04:13 PM UTC

Hi there, I am having a problem disabling the automatic add row functionality on a Datagrid that is displaying related child records (from a dataset relation). First I am selecting Customers and Orders from the Northwind database and setting a relation between them in the dataset. da = New OleDbDataAdapter("SELECT * FROM Customers", cnn) da.Fill(myDataSet, "Customers") da = New OleDbDataAdapter("SELECT * FROM Orders", cnn) da.Fill(myDataSet, "Orders") myDataSet.Relations.Add("Customer_Orders", _ myDataSet.Tables("Customers").Columns("CustomerID"), _ myDataSet.Tables("Orders").Columns("CustomerID"), True) Then I bind the data to my controls on the form: Me.txtCompany.DataBindings.Add("Text", myDataSet, "Customers.CompanyName") Me.txtCustID.DataBindings.Add("Text", myDataSet, "Customers.CustomerID") Me.txtContact.DataBindings.Add("Text", myDataSet, "Customers.ContactName") Me.grdOrdersGrid.SetDataBinding(myDataSet, "Customers.Customer_Orders") Then I grab references to the Currency Managers into some form variables: Me.CmOrders = DirectCast(Me.grdOrdersGrid.BindingContext(Me.grdOrdersGrid.DataSource, Me.grdOrdersGrid.DataMember), CurrencyManager) Me.CmCustomer = DirectCast(Me.BindingContext(myDataSet, "Customers"), CurrencyManager) Then I set AllowNew to false on the Datagrid's DataView: DirectCast(Me.CmOrders.List, DataView).AllowNew = False Okay! Great that all works fine. The asterik (*) at the bottom of the grid does not display and I am not able to add records to the child. UNTIL.... I have buttons on the form for navigating through the Customers (Master) by setting the position on the customer Currency Manager. For instance, when I click the Next button on my form I issue the following: Me.CmCustomer.Position += 1 It works well, the customer controls show the new record and the datagrid updates to show the related records. BUT.. the asterik is back! The datagrid now allows automatic adds again! I set breakpoints and look at the AllowNew property and it is still set to False. I even tried setting it again and again after the position change on the customer.. still no luck! TIA, -Funkyone

Replied On August 2, 2003 05:14 PM UTC

Okay I figured it out! I found out that the child data view is recreated every time the position is changed in the parent data view so I added an Event Handler on my Customer Currency Manager to reset the DataView AllowNew property to false: Private Sub CmCustomer_PositionChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles CmCustomer.PositionChanged Me.SetOrdersView() End Sub Private Sub SetOrdersView() Me.DvOrders = DirectCast(Me.CmOrders.List, DataView) Me.DvOrders.AllowNew = False End Sub Thanks anyways! :-)

Replied On August 3, 2003 01:27 AM UTC

Hi, i have a problem that how can i read a picture file from the openfileDialog to the Picturebox. which class I can use?Streamread or filestream? Thanks.

Johnny Nguyen
Replied On September 8, 2003 02:26 PM UTC

Hi funkyone, I'm also working on this sample Customer-Orders detail and I could not make the AddNew function to not add a new row to the datagrid ( the asterisk). Can you post all the code that you have so I can take a look at them. And also do you know how to add a checkbox or textbox to both the master and the detail grids? Thanks a lot


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