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SqlMembershipProvider.GetNumberOfUsersOnline Method

Returns the number of users currently accessing the application.

Namespace:  System.Web.Security
Assembly:  System.Web (in System.Web.dll)

'Declaration
Public Overrides Function GetNumberOfUsersOnline As Integer

Return Value

Type: System.Int32
The number of users currently accessing the application.

This method is called by the Membership class to retrieve the number of users considered online from the SQL Server database specified in the ASP.NET application's configuration file (Web.config).

GetNumberOfUsersOnline returns the number of users of the current application whose last activity date and time is greater than the current date and time less the value of the UserIsOnlineTimeWindow property in minutes.

Only users associated with the configured ApplicationName are included in the count.

The following code example returns a list of users with a count of the users currently online.

NoteNote

This example uses the Membership class to call the SqlMembershipProvider specified as the defaultProvider in the Web.config file. If you need to access the default provider as the type SqlMembershipProvider, you can cast the Provider property of the Membership class. To access other configured providers as a specific provider type, you can access them by their configured name with the Providers property of the Membership class and cast them as the specific provider type.


<%@ Page Language="VB" %>
<%@ Import Namespace="System.Web.Security" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

Dim pageSize As Integer = 5
Dim totalUsers As Integer
Dim totalPages As Integer
    Dim currentPage As Integer = 1

Public Sub Page_Load()
  If Not IsPostBack Then
    GetUsers()
  End If
End Sub

Private Sub GetUsers()
  UsersOnlineLabel.Text = Membership.GetNumberOfUsersOnline().ToString()

  UserGrid.DataSource = Membership.GetAllUsers(currentPage-1, pageSize, totalUsers)
  totalPages = ((totalUsers - 1) \ pageSize) + 1

  ' Ensure that we do not navigate past the last page of users.

  If currentPage > totalPages Then
    currentPage = totalPages
    GetUsers()
    Return
  End If

  UserGrid.DataBind()
  CurrentPageLabel.Text = currentPage.ToString()
  TotalPagesLabel.Text = totalPages.ToString()

  If currentPage = totalPages Then
    NextButton.Visible = False
  Else
    NextButton.Visible = True
  End If

  If currentPage = 1 Then
    PreviousButton.Visible = False
  Else
    PreviousButton.Visible = True
  End If

  If totalUsers <= 0 Then
    NavigationPanel.Visible = False
  Else
    NavigationPanel.Visible = True
  End If
End SUb

Public Sub NextButton_OnClick(sender As Object, args As EventArgs)
  currentPage = Convert.ToInt32(CurrentPageLabel.Text)
  currentPage += 1
  GetUsers()
End Sub

Public Sub PreviousButton_OnClick(sender As Object, args As EventArgs)
  currentPage = Convert.ToInt32(CurrentPageLabel.Text)
  currentPage -= 1
  GetUsers()
End Sub

</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>Sample: Find Users</title>
</head>
<body>

<form id="form1" runat="server">
  <h3>User List</h3>

  Number of Users Online: <asp:Label id="UsersOnlineLabel" runat="Server" /><br />

  <asp:Panel id="NavigationPanel" Visible="false" runat="server">
    <table border="0" cellpadding="3" cellspacing="3">
      <tr>
        <td style="width:100">Page <asp:Label id="CurrentPageLabel" runat="server" />
            of <asp:Label id="TotalPagesLabel" runat="server" /></td>
        <td style="width:60"><asp:LinkButton id="PreviousButton" Text="< Prev"
                            OnClick="PreviousButton_OnClick" runat="server" /></td>
        <td style="width:60"><asp:LinkButton id="NextButton" Text="Next >"
                            OnClick="NextButton_OnClick" runat="server" /></td>
      </tr>
    </table>
  </asp:Panel>

  <asp:DataGrid id="UserGrid" runat="server"
                CellPadding="2" CellSpacing="1"
                Gridlines="Both">
    <HeaderStyle BackColor="darkblue" ForeColor="white" />
  </asp:DataGrid>

</form>

</body>
</html>


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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