Problems with loading value after postback - asp.net

Question

I got a toolbar with different actions the user can start. In the user interface it looks like:
If I press on the "Ok" button the value will not known at the backend. My code structure is the following:
Configuration of an action
<Action Id="MyAction" Name="Action with Form">
<Form>
<asp:TextBox xmlns:asp="System.Web.UI.WebControls" ID="txtValue" runat="server" />
</Form>
</Action>
ASPX-File
<asp:Content ContentPlaceHolderID="cphToolbar" Runat="Server">
<asp:PlaceHolder ID="plhToolbar" runat="server" />
</asp:Content>
VB-File to the ASPX-File
Partial Class Form
Inherits UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Me.plhToolbar.Controls.Add(Me.CreateActionToolbar(<XML configuration element for the toolbar>))
End Sub
End Class
Page base class
Namespace UI
Public MustInherit Class Page
Inherits System.Web.UI.Page
Protected Overridable Function CreateActionToolbar(source As XmlElement) As Interfaces.IActions
Dim oAction As Interfaces.IActions = Me.LoadControl("~/Controls/Toolbar/Actions.ascx")
For Each element As XmlElement In source.SelectNodes("node()").OfType(Of XmlElement)()
Dim NewItem As New Controls.ActionItem
'set settings for the toolbar element
'add fields to form
For Each Item As XmlNode In element.SelectNodes("Form/node()", oNamespaceManager)
If (TypeOf Item Is XmlElement) Then
If (NewItem.Fields Is Nothing) Then NewItem.Fields = New List(Of XmlElement)
NewItem.Fields.Add(Item)
End If
Next
oAction.Items.Add(NewItem)
Next
Return oAction
End Function
End Class
End Namespace
Action user control
Partial Class Actions
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
For Each Item As ActionItem In Me.Items
'set settings for action
If (Not (Item.Fields Is Nothing)) Then
Dim oPanel As New Panel
oPanel.ID = "dlgActionPanel" & Me.dlgAction.Controls.Count
Me.dlgAction.Controls.Add(oPanel)
Dim oFields As New Panel
oFields.ID = oPanel.ID & "_Controls"
For Each Field As XmlElement In Item.Fields
Dim oControl As System.Web.UI.Control = Nothing
Try
oControl = Me.ParseControl(Field.OuterXml)
Catch ex As Exception
oControl = New LiteralControl("<font style=""color:red;"">" & ex.Message & "</font>")
End Try
oFields.Controls.Add(oControl)
Next
Dim pnlResult As New Panel
Dim btnOk As New Button
btnOk.ID = "btnOk_" & oPanel.ID
AddHandler btnOk.Click, AddressOf Ok_Click
btnOk.Attributes.Add("onclick", "ShowWaitDialog();")
btnOk.Attributes.Add("ItemId", NewAnchor.Attributes("ItemId"))
btnOk.UseSubmitBehavior = False
btnOk.Text = Me.AcceptDialogText
pnlResult.Controls.Add(btnOk)
Dim btnCancel As New Button
btnCancel.Attributes.Add("onclick", "ShowWaitDialog();$('#" & oPanel.ClientID & "').dialog('close');CloseWaitDialog();return false;")
btnCancel.Text = Me.CancelDialogText
pnlResult.Controls.Add(btnCancel)
oPanel.Controls.Add(oFields)
oPanel.Controls.Add(pnlResult)
Dim strMessageControlId As String = oPanel.ClientID
strClientScript &= "$(""#" & strMessageControlId & """).dialog({" & NewLine
strClientScript &= " bgiframe:true, " & NewLine
strClientScript &= " autoOpen:false, " & NewLine
strClientScript &= " modal:true, " & NewLine
strClientScript &= " closeOnEscape:false, " & NewLine
strClientScript &= " width:600, " & NewLine
strClientScript &= " height:450, " & NewLine
strClientScript &= " minWidth:450, " & NewLine
strClientScript &= " minHeight:300, " & NewLine
If (Not (Item.Description Is Nothing)) Then strClientScript &= " title:'" & Item.Description & "', " & NewLine
strClientScript &= " open: function(event, ui) { $("".ui-dialog-titlebar-close"").hide(); } " & NewLine
strClientScript &= "});" & NewLine
If (String.IsNullOrEmpty(NewAnchor.Attributes("onclick"))) Then NewAnchor.Attributes.Add("onclick", String.Empty)
NewAnchor.Attributes("onclick") &= "$('#" & oPanel.ClientID & "').dialog('open');"
End If
Next
End Sub
Private Sub Ok_Click(ByVal sender As Object, ByVal e As EventArgs)
Dim oDialog As Panel = Nothing
If (Not (String.IsNullOrEmpty(sender.ID))) Then oDialog = Me.dlgAction.FindControl(sender.ID.Substring(sender.ID.IndexOf("_") + 1) & "_Controls")
Dim oAction As ActionItem = Items.Find(Function(item) item.ItemId = sender.Attributes("ItemId"))
If (Not (oDialog Is Nothing)) Then
For Each Field As XmlElement In oAction.Fields
Dim oControl As WebControl = Nothing
If (Not (Field.SelectSingleNode("#Id|#ID") Is Nothing)) Then oControl = oDialog.FindControl(Field.SelectSingleNode("#Id|#ID").Value)
If (Not (oControl Is Nothing)) Then
Dim oParameter As SqlClient.SqlParameter = oAction.Parameters.Find(Function(item) item.ParameterName = "#" & oControl.ID.Substring(3))
If (Not (oParameter Is Nothing)) Then
Select Case oControl.GetType.ToString
Case GetType(TextBox).ToString
'After postback the value is empty!!!
If (Not (String.IsNullOrEmpty(CType(oControl, TextBox).Text))) Then oParameter.Value = CType(oControl, TextBox).Text
'more controls
Case Else
End Select
End If
End If
Next
End If
End Sub
End Class
Where is the fault that the value of the TextBox is after PostBack empty and not set because of the View State?
Thanks for any response.

Answer 1

I could solve it. The problem was that the jQuery dialog was not PostBack save. The solution was
$("#dialog").dialog({
appendTo:'form:first'
});