Update DataGridView with dataview - database

Question

I have a VB.NET 2010 application that loads data from SQL Server to a datagridview through adapter.fill(). When I update the database it works fine but my problem is that when i use the dataview to filter the data based on combobox selection the method adapter.update(table) does not work!
Is there away to do it with the filter applied?
Private Sub cmbDepartment_SelectedIndexChanged(...)
Handles cmbDepartment.SelectedIndexChanged
Dim filter As String
Try
lblDepartmentId.Text = ds.Tables("department").Rows(cmbDepartment.SelectedIndex)(0)
filter = "dprtId = " & lblDepartmentId.Text
dvSection = New DataView(ds.Tables("section"), filter, "", DataViewRowState.CurrentRows)
table = dvSection.ToTable
dgvSections.DataSource = table
Catch ex As Exception
MsgBox(Err.Description)
End Try
End Sub
Private Sub btnSaveDepartment_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
Handles btnSaveDepartment.Click
Dim cbDep As SqlCommandBuilder
Dim numRows As Integer
Try cbDep = New SqlCommandBuilder(daDep)
Me.Validate() numRows = daDep.Update(ds.Tables("section"))
MsgBox(numRows & " Rows affected.")
Catch ex As Exception
MsgBox(Err.Description)
End Try
End Sub

Answer 1

The way you are currently doing your filtering is by creating a new DataTable and binding this to your DataGridView data source. This breaks the association between the original DataSet and that table so when you call Update your changes are not recovered.
Try changing to something like the code below instead (I've left out the try catch blocks, they don't change the idea that fixes your problem).
When you first set the data source to the grid set it to a form level private dvSection field:
Public Class Form1
' Here we declare some class level variables.
'These are visible to all members of the class
Dim dvSection As DataView
Dim tableAdapter As New DataSet1TableAdapters.CustomersTableAdapter()
Dim ds As New DataSet1()
Public Sub New()
' This call is required by the designer.
InitializeComponent()
' We fill our dataset - in this case using a table adapter
tableAdapter.Fill(ds.Customers)
dvSection = ds.Customers.DefaultView
DataGridView1.DataSource = dvSection
End Sub
' Here is the code to filter.
' Note how I refer to the class level variable dvSection
Private Sub ComboBox1_SelectedIndexChanged(sender As System.Object, e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
Dim filter As String
lblDepartmentId.Text = ds.Tables("department").Rows(cmbDepartment.SelectedIndex)(0)
filter = "dprtId = " & lblDepartmentId.Text
dvSection.RowFilter = filter
dvSection.RowFilter = filter
End Sub
' And here is the update code referring to the class level table adapter
Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
tableAdapter.Update(ds.Customers)
End Sub
End Class
One other approach that might make things easier is to introduce a binding source and set the filter on that. Either was should work fine however.