asp .net mostrando cuantos usuarios hay online

 

bueno lo primero tenemos que crear un archivo global.asax y agregar el siguiente codigo

 

Sub Session_Start(ByVal sender As Object, ByVal e As EventArgs)
        ' Code that runs when a new session is started
       
        Try
            If IsNumeric(Application.Item("contador")) = False Then
                Application.Item("contador") = 1
            End If
            Dim x1 As Single
            x1 = Val(Application.Item("contador").ToString)
            x1 = x1 + 1
            Application.Item("contador") = x1
            Application.Item("urlref") = Me.Request.UrlReferrer.ToString
        Catch ex As Exception

        End Try
    End Sub

    Sub Session_End(ByVal sender As Object, ByVal e As EventArgs)
        ' Code that runs when a session ends.
        ' Note: The Session_End event is raised only when the sessionstate mode
        ' is set to InProc in the Web.config file. If session mode is set to StateServer
        ' or SQLServer, the event is not raised.
        Try
            If IsNumeric(Application.Item("contador")) = False Then
                Application.Item("contador") = 0
            End If
            Dim x1 As Single
            x1 = Val(Application.Item("contador").ToString)
            x1 = x1 - 1
            Application.Item("contador") = x1
        Catch ex As Exception

        End Try
    End Sub

 

que hace cuando se inicia una sesion se sumara a la variable contador +1 cuando el servidor genere el timeout hara el -1

bueno para mostrar los usuarios online es facil basta en el master page o la pagina principal

poner un control label o  y asignarle el valor

Application.Item("contador"))

    Try

label1.text=Application.Item("contador")) .tostring

Catch ex As Exception

label1.text="no anda naiden xD"

        End Try

apliquen un try por si las moscas

saludos............