Membership.GetNumberOfUsersOnline Method ()
.NET Framework (current version)
Gets the number of users currently accessing an application.
Assembly: System.Web (in System.Web.dll)
GetNumberOfUsersOnline returns the number of users for the current ApplicationName where the last-activity date is greater than the current time less the UserIsOnlineTimeWindow. The last-activity date/time stamp is updated to the current date and time when user credentials are validated by way of the ValidateUser or UpdateUser method or when a call to a GetUser overload that takes no parameters or one that uses the userIsOnline parameter to specify that the date/time stamp should be updated.
The following code example returns a list of users with a count of the number of users currently online.
<%@ Page Language="C#" %> <%@ 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"> int pageSize = 5; int totalUsers; int totalPages; int currentPage = 1; public void Page_Load() { if (!IsPostBack) { GetUsers(); } } private void GetUsers() { UsersOnlineLabel.Text = Membership.GetNumberOfUsersOnline().ToString(); UserGrid.DataSource = Membership.GetAllUsers(currentPage-1, pageSize, out totalUsers); totalPages = ((totalUsers - 1) / pageSize) + 1; // Ensure that we do not navigate past the last page of users. if (currentPage > totalPages) { currentPage = totalPages; GetUsers(); return; } UserGrid.DataBind(); CurrentPageLabel.Text = currentPage.ToString(); TotalPagesLabel.Text = totalPages.ToString(); if (currentPage == totalPages) NextButton.Visible = false; else NextButton.Visible = true; if (currentPage == 1) PreviousButton.Visible = false; else PreviousButton.Visible = true; if (totalUsers <= 0) NavigationPanel.Visible = false; else NavigationPanel.Visible = true; } public void NextButton_OnClick(object sender, EventArgs args) { currentPage = Convert.ToInt32(CurrentPageLabel.Text); currentPage++; GetUsers(); } public void PreviousButton_OnClick(object sender, EventArgs args) { currentPage = Convert.ToInt32(CurrentPageLabel.Text); currentPage--; GetUsers(); } </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
Available since 2.0
Available since 2.0
Show: