[dba-VB] VB.net data bound form problem

 Hi Paul --

It should work.
How have you "added a datasource and dataset"?
It usually happens in reverse order:

- 1st - a blank dataset is added;
- 2nd - a data table is dragged from 'Server Explorer' window entry and dropped on dataset by thus creating a datasource...

Of course there are many other variations...

-- Shamil

Wednesday, March 12, 2014 6:23 PM UTC from Paul Hartland <paul.hartland at googlemail.com>:
>To all,
>
>Sorry to the Access group for the OT but I do not seem to be getting any
>response from the visual basic list.  I am what I call a developer dinosaur
>I know VBA and VB6, keep trying to learn VB.net and C#, but always get
>sidetracked, however after going on a three day introduction course for
>ASP.net MVC development using VB.net has got me interested again.  I have
>SQL Server 2012 Express and Visual Studio 2012 Express installed, I created
>a new blank database and as I am just messing about imported the Customers
>table from the Northwind sample, I then opened a new Visual Basic project,
>kept the form as Form1 and added a datasource and dataset
>called TestDataSet, I then dragged the CustomerID field onto the form and
>it appeared along with a binding navigator at the top of the form, without
>me doing anything the code behind the form looks like this
>
>Public Class Form1
>
>    Private Sub CustomersBindingNavigatorSaveItem_Click(sender As Object, e
>As EventArgs) Handles CustomersBindingNavigatorSaveItem.Click
>        Me.Validate()
>        Me.CustomersBindingSource.EndEdit()
>        Me.TableAdapterManager.UpdateAll(Me.TestDataSet)
>    End Sub
>
>    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles
>MyBase.Load
>        'TODO: This line of code loads data into the
>'TestDataSet.Customers' table. You can move, or remove it, as needed.
>        Me.CustomersTableAdapter.Fill(Me.TestDataSet)
>
>    End Sub
>End Class
>
>So I started up the application and could flick through all the ID's using
>the navigation buttons, however if I try to change an ID then click the
>save icon on the binding navigator I get the following error:
>
>An unhandled exception of type 'System.InvalidOperationException' occurred
>in Northwind.exe
>
>Additional information: Update requires a valid UpdateCommand when passed
>DataRow collection with modified rows.
>
>and the line of code Me.TableAdapterManager.UpdateAll(Me.TestDataSet) is
>highlighted, I assumed that as the binding navigator was working the save
>would too.
>
>Can anyone tell me what is wrong and/or point me in the right direction to
>do this a better way.
>
>Many thanks in advance for any help on this.
>
>Kind Regards,
>
>Paul
>
>