' Copyright 2011 ESRI
' 
' All rights reserved under the copyright laws of the United States
' and applicable international laws, treaties, and conventions.
' 
' You may freely redistribute and use this sample code, with or
' without modification, provided you include the original copyright
' notice and use restrictions.
' 
' See the use restrictions.
' 

Imports Microsoft.VisualBasic
Imports System
Partial Public Class _Default
  Inherits System.Web.UI.Page
  Protected Sub Page_PreInit(ByVal sender As Object, ByVal e As System.EventArgs)
    ' At startup, we check whether all resources can be initialized with the
    ' current user's identity. We've already done impersonation in the
    ' Global.asax, so the page is running with the browser user's identity. 
    ' Note this code is optional, as it just displays a message if a service
    ' can't be connected to.

    If (Not Page.IsPostBack) Then
      Dim resourceFailed As Boolean = False

      ' See whether we can initialize each resource. Since we're 
      ' impersonating the user, initialization failure can mean an invalid 
      ' user for the service.
      For Each mapResourceItem As ESRI.ArcGIS.ADF.Web.UI.WebControls.MapResourceItem In MapResourceManager1.ResourceItems
        ' If not already initialized, attempt to initialize the resource
        If mapResourceItem.Resource Is Nothing OrElse (Not mapResourceItem.Resource.Initialized) Then
          mapResourceItem.InitializeResource()
        End If

        ' Set failure flag if this resource fails to initialize
        If mapResourceItem.FailedToInitialize Then
          resourceFailed = True
        End If
      Next mapResourceItem

      ' If one or more resources couldn't be connected to, display the 
      ' label containing the notification message.  Note that failure could 
      ' also be caused by other issues, such as the map server or service 
      ' being unavailable.
      ResourceFailureLabel.Visible = resourceFailed
    End If
  End Sub
End Class