Creating a visit counter for a web form in ASP.NET

We can count how many times a given page has been requested by various clients. Using an application state. Now drag and drop a label control on the form. Now double click on the form and add the following code.

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

Dim count As Integer = 0

If Application("Pagecount") IsNot Nothing Then

count = CInt(Application("Pagecount"))

End If

count += 1

Application("Pagecount") = count

Label1.Text = " total Page Visited: " & count.ToString() & "Times"

End Sub

Problem with Above code

In the above code, a page counter would probably not keep an accurate count. For example, if two clients requested the page at the same time. Then deadlock will occur. We can avoid deadlock occurrence while we updating application variable by multiple users with help of Lock() and UnLock().

Adding the following code with lock and unlock method.

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

Application.Lock()

Dim count As Integer = 0

If Application("Pagecount") IsNot Nothing Then

count = CInt(Application("Pagecount"))

End If

count += 1

Application("Pagecount") = count

Application.UnLock()

Label1.Text = "Total Page Visited: " & count.ToString() & "Times"

End Sub