I am developing an application where it displays a table that I have on the server and I would like the user to update it (insert/delete/update) directly within the application.

I created a telerik RadGridView named definitionView to display the data and I am following the instructions given directly from the Telerik Documentation: Updating the Database with ADO.NET

However I am stuck with the first part: Updating the database when the current row is changed

I tried to adapt the code shown in the example to my code but I keep getting an error on the adapter.Update() statement.

Public Class definitionSolution
    Private lastEditRow As DataRow = Nothing
    Private bindingSource

    Public Sub New()
        InitializeComponent()
        Dim bindingSource As New BindingSource
        Dim dsSolution As New DataSet()
        adapter.Fill(dsSolution, "MyTable")
        bindingSource.DataSource = dsSolution.Tables("MyTable")
        definitionView.DataSource = bindingSource
        AddHandler bindingSource.CurrentChanged, AddressOf DefinitionView_CurrentChanged
    End Sub

    Private Sub AutoSavingDataBSEventsForm_Load(ByVal sender As Object, ByVal e As EventArgs)
        ' TODO: This line of code loads data into the 'nwindDataSet.Employees' table. You can move, or remove it, as needed.
        Dim dsSolution As New DataSet()
        adapter.Fill(dsSolution, "MyTable")
        bindingSource.DataSource = dsSolution.Tables("MyTable")
        Dim current As Object = bindingSource.Current
        If current IsNot Nothing Then
            Me.lastEditRow = (CType(current, DataRowView)).Row
        End If
    End Sub

    Private Sub DefinitionView_CurrentChanged(ByVal sender As Object, ByVal e As EventArgs)
        Dim dataRow As DataRow = CType(CType(sender, BindingSource).Current, DataRowView).Row
        If lastEditRow IsNot Nothing AndAlso lastEditRow.RowState = DataRowState.Modified Then
            adapter.Update(lastEditRow)
        End If
        lastEditRow = dataRow
    End Sub
End Class

SQLDataAdapter is initialized in another module as follow:

Public queryString = "SELECT * FROM [dbo].Mytable"
Public adapter As New SqlDataAdapter(queryString, DB_CONNECTION)

The error is the following:

Error BC30518   Overload resolution failed because no accessible 'Update' can be called with these arguments:
- Public Overrides Function Update(dataSet As DataSet) As Integer': Value of type 'DataRow' cannot be converted to 'DataSet
- Public Overloads Function Update(dataRows As DataRow()) As Integer': Value of type 'DataRow' cannot be converted to 'DataRow()
- Public Overloads Function Update(dataTable As DataTable) As Integer': Value of type 'DataRow' cannot be converted to 'DataTable

Does anybody has an idea on how to solve this issue?

Also from their doc:

Let's assume that we have an ADO.NET DataTable that loads its data from a SqlDataAdapter and it is bound to a BindingSource component. Further, the BindingSource component is bound to RadGridView control.

I understand that I have a DataSet from SqlDataAdapter that is bound to a BindingSource component but I miss the last bit. What does it mean to bound a BindingSource to the RadGridView control?

Edit after @jmcilhinney comments

Switching from adapter.Update(lastEditRow) to adapter.Update(dsSolution) gives me the following error:

System.Reflection.AmbiguousMatchException: 'Overload resolution failed because no Public 'Update' is most specific for these arguments:
    'Public Overrides Function Update(dataSet As System.Data.DataSet) As Integer':
        Not most specific.
    'Public Function Update(dataRows As System.Data.DataRow()) As Integer':
        Not most specific.
    'Public Function Update(dataTable As System.Data.DataTable) As Integer':
        Not most specific.'

Switching from adapter.Update(lastEditRow) to adapter.Update(lastEditRow.ItemArray) gives me the following error:

System.InvalidCastException: 'Unable to cast object of type 'System.Object[]' to type 'System.Data.DataRow[]'

CodePudding user response：

Your data adapter's Update method accepts multiple rows and performs inserts, updates and deletes as required. That Update method is overloaded and it will accept a DataRow array, so you can put your single row into an array and pass that:

adapter.Update({lastEditRow})

Otherwise, you need to pass the whole DataTable and let it pick out the row(s) that needs saving.