DetailsView Trouble Retrieving Values - asp.net

Question

The purpose of my detailsview is to collect report parameters for the user to enter when running a report. So I build the details view dynamically because report parameters are data driven, stored in the database per the report.
The object being bound to is created by reflection dynamically at run-time from the report parameters, with one property per each parameter, so it contains simple date or collection properties, which I turn into a combo box or date box dynamically by creating templates dynamically.
In the item_updating event, I simply want to get the values the user entered so I know how to run the report.
I looked in all the properties of e and also tried findcontrol to get to the values the user entered. both e and findcontrol are empty. This is how I got data back in the past so I don't know why they aren't there. It almost as if the controls themselves are not represented in the object model of the detailsview at that time.
<asp:DetailsView ID="DetailsView1" runat="server" AutoGenerateRows="false" DefaultMode="Edit" >
<Fields>
<asp:CommandField ButtonType="Button" UpdateText="Run" ShowCancelButton="false" ShowEditButton="true" />
</Fields>
</asp:DetailsView>
code behind
Private Sub BuildDetailView(DataSource As Object)
Dim Properties() As System.Reflection.PropertyInfo = DataSource.GetType.GetProperties
Dim Template As System.Web.UI.ITemplate
For Each PropertyInfo As System.Reflection.PropertyInfo In Properties
Template = Nothing
If PropertyInfo.PropertyType Is GetType(System.DateTime) Then
Template = New DateTemplate(DataSource, PropertyInfo)
ElseIf GetType(ICollection).IsAssignableFrom(PropertyInfo.PropertyType) Then
Template = New ListTemplate(DataSource, PropertyInfo, Report.InputReportParameters(Array.IndexOf(Properties, PropertyInfo)).Enumeration.MultiSelect)
End If
If Template IsNot Nothing Then
Dim TemplateField As New TemplateField
TemplateField.HeaderText = PropertyInfo.Name
TemplateField.ItemTemplate = Template
DetailsView1.Fields.Add(TemplateField)
End If
Next
End Sub
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
CheckAuthentication()
BuildDetailView(Report.ReportParametersDataObject)
If Report.ReportParameters.Any AndAlso Not Report.InputReportParameters.Any Then
Run() 'no parameters are for data entry
ElseIf Not IsPostBack Then
lblReportType.Text = String.Format("Report {0}", Report.Type)
DetailsView1.DataSource = New List(Of Object) From {Report.ReportParametersDataObject}
DetailsView1.DataBind()
End If
End Sub
Protected Sub DetailsView1_ItemUpdating(sender As Object, e As System.Web.UI.WebControls.DetailsViewUpdateEventArgs) Handles DetailsView1.ItemUpdating
Run(e.NewValues)
End Sub
List Template helper:
Public Class ListTemplate
Implements System.Web.UI.ITemplate
Public Sub New(DataSource As Object, PropertyInfo As System.Reflection.PropertyInfo, Multiselect As Boolean)
Me.DataSource = DataSource
Me.PropertyInfo = PropertyInfo
Me.Multiselect = Multiselect
End Sub
Private DataSource As Object
Private Multiselect As Boolean
Private PropertyInfo As System.Reflection.PropertyInfo
Public Sub InstantiateIn(container As System.Web.UI.Control) Implements System.Web.UI.ITemplate.InstantiateIn
Dim ListBox As New System.Web.UI.WebControls.ListBox
ListBox.DataSource = PropertyInfo.GetValue(DataSource, Nothing)
ListBox.DataTextField = "Text"
ListBox.DataValueField = "Value"
ListBox.SelectionMode = IIf(Multiselect, ListSelectionMode.Multiple, ListSelectionMode.Single)
ListBox.Rows = Math.Min(25, ListBox.DataSource.count)
ListBox.EnableViewState = True
container.Controls.Add(ListBox)
End Sub
End Class
DateTemplate Helper:
Public Class DateTemplate
Implements System.Web.UI.ITemplate
Public Sub New(DataSource As Object, PropertyInfo As System.Reflection.PropertyInfo)
Me.DataSource = DataSource
Me.PropertyInfo = PropertyInfo
End Sub
Private DataSource As Object
Private PropertyInfo As System.Reflection.PropertyInfo
Public Sub InstantiateIn(container As System.Web.UI.Control) Implements System.Web.UI.ITemplate.InstantiateIn
Dim Textbox As New System.Web.UI.WebControls.TextBox
Textbox.ID = PropertyInfo.Name.Replace(" ", String.Empty)
Textbox.EnableViewState = True
Dim CalendarExtender As New AjaxControlToolkit.CalendarExtender
CalendarExtender.TargetControlID = Textbox.ID
CalendarExtender.SelectedDate = PropertyInfo.GetValue(DataSource, Nothing)
CalendarExtender.DefaultView = AjaxControlToolkit.CalendarDefaultView.Months
CalendarExtender.Format = "MMMM yyyy"
container.Controls.Add(Textbox)
container.Controls.Add(CalendarExtender)
End Sub
End Class

Answer 1

In the absense of any answers or even comments, I worked around this issue by creating my own asp.net custom control.
The way it works is very simple. It has a DataSource property and it creates the UI adding an edit widget for each property. According to the propertyinfo.propertytype, it creates an editor for that type.
Once the user submits changes it raises a server-side event handing back the datasource object containing the changed values.
It's so simple, even I can understand how to use it.