Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        If Not IsPostBack Then
            dsSoftware = SoftwareDB.getEntries
            Me.BindDataGrid()
            Session("dsSoftware") = dsSoftware
        Else
            'no code needed here, the previous code returned too much of the dataset
        End If
    End Sub

Connect.ConnectionString = ConnectString
        Adapter.SelectCommand = New OleDbCommand(SelectStatement, Connect)
        Adapter.SelectCommand.Connection.Open()
        Adapter.Fill(dsSoftware, "[SOFTWARE DATABASE]")
        softwareGrid.DataSource = dsSoftware.Tables("[SOFTWARE DATABASE]")
                Session("dsSoftware") = dsSoftware
        Page.DataBind()
    End Sub

Public Sub softwareGrid_EditCommand(ByVal source As Object, _
        ByVal e As System.Web.UI.WebControls.DataGridCommandEventArgs) _
        Handles softwareGrid.EditCommand

        If Session("Add Mode") = True Then
            Dim i As Integer = dsSoftware.Tables("[SOFTWARE DATABASE]").Rows.Count - 1
            dsSoftware.Tables("[SOFTWARE DATABASE]").Rows(i).Delete()
            Session("AddMode") = False
        End If
        softwareGrid.EditItemIndex = e.Item.ItemIndex
        'this is the line that triggers the error:
        Me.BindDataGrid()
    End Sub

Private Sub BindDataGrid()
        softwareGrid.DataSource = dsSoftware
        softwareGrid.DataMember = "[SOFTWARE DATABASE]"
        softwareGrid.DataKeyField = "Software #"
        softwareGrid.DataBind()
    End Sub