ASP.Net State Management

State Management
1.       Hidden Tags
2.       Request variable
3.       Cookies
4.       URL Rewriting  default.aspx?session= Session.SessionID
5.       Session Tracking : match  Session.SessionID

Cookies: If enabled in browser then work Eg:

Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click

        Dim ck As New HttpCookie("myCookie", "vinod")

        Dim d As New Date

        d.AddDays(1)

        ck.Expires = d 'persist for 1 day

        Response.Cookies.Add(ck)

        Response.Redirect("cookie2.aspx")

    End Sub

In cookies2.aspx access it like this:

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

        If Not Request.Cookies.Item("myCookie") Is Nothing Then

            Response.Write(Request.Cookies.Item("myCookie").Name)

            Response.Write(Request.Cookies.Item("myCookie").Value)

            Response.Write(Request.Cookies.Item("myCookie").Path)

        End If

    End Sub

Request: Request.Form, Request.querystring, Request.Params

For Request.forms remove runat=server and add action="default4.aspx" in Form Tag

If Request.HttpMethod.Equals("Get") Then

            Dim v = Request.QueryString("mode")

        Else

            Dim v = Request.Form("t") 'where t is the input name = "t" id ="t" in html

End If

 Tracing: Its a debugging mechanism. To enable trace Add following line in your web.config file inside system.web replace ( and ) with < and >

(trace enabled="true " pageOutput="false" requestLimit ="10" traceMode="SortByTime "/)

pageOutput="True" if wanna show trace at client else use http:\url\trace.axd   on server to get trace detail. It also show server variables detail in bottom.

Protected Sub Button2_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button2.Click

        Trace.Write("Trace Method")

        Try

            Dim i, j, k

            i = 10

            k = 0

            j = i / k

        Catch ex As Exception

            Trace.Warn(e.ToString)

        End Try

    End Sub

-Vinod Kotiya

www.vinodkotiya.com