1. Cookies

2. Data in Cookies Which web site set the cookie Expiration date –DateTime data type –TimeSpan data type One or more pieces of data Keys Define a new cookie: –Dim CookieCID as new HttpCookie(“cid”) Add to: Response.Cookies –Response.cookies.add(cookieCID)

3. Cookie’s Properties System.Web/HttpCookie –Name –Value –Expires To write a cookie: –Response.Cookies.Add(cookieObj)

4. Creating Cookies dim cookieCID as New HttpCookie("cid") dim cookieCNAME as new HttpCookie("cname") dim dt as dateTime=dateTime.now() dim ts as new TimeSpan(30,0,0,0) cookieCID.value=cid.text cookieCname.value=cname.text cookieCID.expires=dt.add(ts) cookieCname.expires=dt.add(ts) response.cookies.add(cookieCID) response.cookies.add(cookieCNAME) Note: The name(or key)of cookieCID is “cid” Demo: ASPNET/CookieForm.aspx

5. sub setCookie(Sender As Object, E As EventArgs) dim cookieCID as New HttpCookie("cid") dim cookieCNAME as new HttpCookie("cname") dim dt as dateTime=dateTime.now() dim ts as new TimeSpan(30,0,0,0) cookieCID.value=cid.text cookieCname.value=cname.text cookieCID.expires=dt.add(ts) cookieCname.expires=dt.add(ts) response.cookies.add(cookieCID) response.cookies.add(cookieCNAME) end sub Please enter customer ID: Please enter your name: This ID and name will be used to set your cookie.

6. Reading Cookies Dim custid as string Dim custName as string custid=request.cookies("cid").value custname=request.cookies("cname").value

7. Demo: CookieRead.ASPX sub page_load() cid.text=request.cookies("cid").value cname.text=request.cookies("cname").value cookieCount.text=cstr(request.cookies.count) Dim ckey As String For Each ckey In Request.Cookies.Keys Response.Write(ckey) Next end sub Note: SessionID

8. Using Cookie with DataReader dim strConn as string ="Provider=Microsoft.Jet.OLEDB.4.0;Data Source = c:\sales2k.mdb" dim objConn as new OledbConnection(strConn) dim strSQL as string dim objDataReader as oledbDataReader dim cid as string cid=request.cookies("CID").value strSQL="select * from webcustomer where CustID= '" & cid & "'" dim objComm as new OledbCommand(strSQL,objConn) objDataReader=objComm.executeReader() objDataReader.Read() session("cname")=objDataReader("CustName") response.write (" Welcome:" & objDataReader("CustName") & " ") Demo:ASPNET/CookieGreeting.aspx

9. Demo: CookieGreetingShowOrder.aspx sub page_Load() If not Page.IsPostBack then dim cid as string cid=request.cookies("CID").value objConn.open() strSQL="select * from webcustomer where CustID= '" & cid & "'" dim objComm as new OledbCommand(strSQL,objConn) objDataReader=objComm.executeReader() if notobjDataReader.Read()then response.write("We don't have your record" & " ") else response.write (" Welcome:" & objDataReader("CustName") & " ") end if session("cid")=cid session("cname")=objDataReader("CustName") objConn.close() end if end sub

10. sub showOrders(sender as object, e as EventArgs) dim cid, cname as string cid=session("cid") cname=session("cname") msg1.text=cname & " orders: " objConn.open() strSQL="select * from webOrder where CustID= '" & cid & "'" dim objComm as new OledbCommand(strSQL,objConn) objDataReader=objComm.executeReader() dgOrder.Datasource=objDataReader dgOrder.DataBind() objConn.close() end sub

11. Session System.Web.HttpSessionState Properties: –SessionID –IsCookieLess –TimeOut –Count Methods –Abandon

12. Working with the Session To place a value into the collection simply assign it a key and then assign the value: –Session (“Age”)=25 To read values from the collection: –myAge = Session(“Age”) Session ID: –Session.SessionID Demo: sessionID.aspx To remove a session –Session.abandon

13. Increase Counter by One. What is wrong? dim counter as integer sub Page_Load() counter=0 end sub sub IncreaseCounter(sender as object, e as EventArgs) counter=counter+1 response.write("The counter's value is:" + cstr(counter)) end sub Demo: StateTestCounter.ASPX

14. Save Counter in Session Demo: StateTestCounter2.ASPX dim counter as integer sub Page_Load() if not page.isPostBack then counter=0 session("MyCounter")=counter else counter=session("MyCounter") end if end sub sub IncreaseCounter(sender as object, e as EventArgs) counter=counter+1 response.write("The counter's value is:" + cstr(counter)) session("MyCounter")=counter End sub