How to Know No. Of users Logged In?

STEP 1 

Add below lines in  Global.asax File

Sub Application_Start(ByVal sender As Object, ByVal e As EventArgs)

Application.Add("UserCount", 0)

End Sub



Sub Session_Start(ByVal sender As Object, ByVal e As EventArgs)

Dim UserCount As Integer
UserCount = Convert.ToInt32(Application.Get("UserCount").ToString())
UserCount = UserCount + 1
Application.Set("UserCount", UserCount)

End Sub

Sub Session_End(ByVal sender As Object, ByVal e As EventArgs)

Dim UserCount As Integer
UserCount = Convert.ToInt32(Application.Get("UserCount").ToString())
UserCount = UserCount - 1
Application.Set("UserCount", UserCount)

End Sub

Step: 2 

Add a Web.Config File

  < sessionState mode="InProc"/ >        

Step: 3
Code Behind

   TextBox1.Text = Application.Get("UserCount").ToString()