ASP.NET

Dim userId As String = Session("UserID")
        Dim multipleLogin As New Dictionary(Of String, String)()
        multipleLogin = New Dictionary(Of String, String)()
        Application.Lock()
        multipleLogin = DirectCast(Application("MultipleLogin"), Dictionary(Of String, String))
        If (multipleLogin.ContainsKey(userId)) Then
            Response.Output.Write("<script>alert(You have already signed in. Loggin out)</script>")
            Session.Clear()
            Response.Redirect("~/Login.aspx")
        End If

        multipleLogin.Add(userId, Session.SessionID)
        Application("MultipleLogin") = multipleLogin
        Application.UnLock()

Server.MapPath("MyFile.txt") 

developerit wrote:

please make this application with asp.net with c#

Abhijit Jana wrote:

Creating DLL for each file is not a good practice