The example below uses session state to determine how many times a particular session accesses the XML Web service method SessionHitCounter.
<%@ WebService Language="VB" Class="Util" %>
Imports System.Web.Services
Public Class Util
Inherits WebService
<WebMethod(Description := "Per session Hit Counter", _
EnableSession := True)> _
Public Function SessionHitCounter() As Integer
If Session("HitCounter") Is Nothing Then
Session("HitCounter") = 1
Else
Session("HitCounter") = CInt(Session("HitCounter")) + 1
End If
Return CInt(Session("HitCounter"))
End Function
End Class
<%@ WebService Language="C#" Class="Util" %>
using System.Web.Services;
public class Util: WebService {
[ WebMethod(Description="Per session Hit Counter",EnableSession=true)]
public int SessionHitCounter() {
if (Session["HitCounter"] == null) {
Session["HitCounter"] = 1;
}
else {
Session["HitCounter"] = ((int) Session["HitCounter"]) + 1;
}
return ((int) Session["HitCounter"]);
}
}
The following code example is a Web Forms client of an XML Web service that uses session state. The client persists the HTTP cookie that uniquely identifies the session by storing it in the client's session state.
<%@ Page Language="VB" %>
<%@ Import Namespace="System.IO" %>
<%@ Import Namespace="System.Net" %>
<html>
<script runat=server>
Public Sub EnterBtn_Click(src As Object, E As EventArgs)
' Create a new instance of a proxy class for your XML Web service.
Dim su As ServerUsage = new ServerUsage()
Dim cookieJar As CookieContainer
' Check to see if the cookies have already been saved for this session.
If (Session("CookieJar") Is Nothing)
cookieJar= new CookieContainer()
Else
cookieJar = Session("CookieJar")
End If
' Assign the CookieContainer to the proxy class.
su.CookieContainer = cookieJar
' Invoke an XML Web service method that uses session state and thus cookies.
Dim count As Integer = su.PerSessionServiceUsage()
' Store the cookies received in the session state for future retrieval by this session.
Session("CookieJar") = cookieJar
' Populate the text box with the results from the call to the XML Web service method.
SessionCount.Text = count.ToString()
End Sub
</script>
<body>
<form runat=server ID="Form1">
Click to bump up the Session Counter.
<p>
<asp:button text="Bump Up Counter" Onclick="EnterBtn_Click" runat=server ID="Button1" NAME="Button1"/>
<p>
<asp:label id="SessionCount" runat=server/>
</form>
</body>
</html>
<%@ Page Language="C#" %>
<%@ Import Namespace="System.IO" %>
<%@ Import Namespace="System.Net" %>
<html>
<script runat="server">
void EnterBtn_Click(Object Src, EventArgs E)
{
// Create a new instance of a proxy class for your XML Web service.
ServerUsage su = new ServerUsage();
CookieContainer cookieJar;
// Check to see if the cookies have already been saved for this session.
if (Session["CookieJar"] == null)
cookieJar= new CookieContainer();
else
cookieJar = (CookieContainer) Session["CookieJar"];
// Assign the CookieContainer to the proxy class.
su.CookieContainer = cookieJar;
// Invoke an XML Web service method that uses session state and thus cookies.
int count = su.PerSessionServiceUsage();
// Store the cookies received in the session state for future retrieval by this session.
Session["CookieJar"] = cookieJar;
// Populate the text box with the results from the call to the XML Web service method.
SessionCount.Text = count.ToString();
}
</script>
<body>
<form runat=server ID="Form1">
Click to bump up the Session Counter.
<p>
<asp:button text="Bump Up Counter" Onclick="EnterBtn_Click" runat=server ID="Button1" NAME="Button1"/>
<p>
<asp:label id="SessionCount" runat=server/>
</form>
</body>
</html>