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Sample page in ASP.NET to show you different collections like Forms, Querystring, Cookies etc

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Sometimes, while troubleshooting I am interested to find out all the details about certain collections in ASP.NET, like Forms, QueryStrings, Headers, ServerVariables, Cookies, Sessions and Params... I created a very simple aspx page which would show you all the details...

Create any text file with .aspx extension in your IIS (I have named it Collection.aspx)

<%@ Page Language="vb"%>
<script runat="server">
    Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs)
        Session("Test1") = "Testing 1"
        Session("Test2") = "Testing 2"
        Session("Test3") = "Testing 3"
        Session("Test4") = "Testing 4"
        Session("Test5") = "Testing 5"
        If Not IsPostBack Then
            Response.Cookies.Add(New HttpCookie("TC1", "Test Cookie 1"))
            Response.Cookies.Add(New HttpCookie("TC2", "Test Cookie 2"))
            Response.Cookies.Add(New HttpCookie("TC3", "Test Cookie 3"))
            ddList.Items.Add(String.Empty)
            ddList.Items.Add("forms")
            ddList.Items.Add("querystring")
            ddList.Items.Add("headers")
            ddList.Items.Add("servervariables")
            ddList.Items.Add("cookies")
            ddList.Items.Add("session")
            ddList.Items.Add("params")
            ddList.AutoPostBack = True
        Else
            Response.Write("<BR><BR><HR>")
        End If
    End Sub
    Private Sub ddList_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs)
        Select Case ddList.SelectedItem.ToString
            Case "forms"
                EnumerateCollection(Request.Form)
            Case "querystring"
                EnumerateCollection(Request.QueryString)
            Case "headers"
                EnumerateCollection(Request.Headers)
            Case "servervariables"
                EnumerateCollection(Request.ServerVariables)
            Case "param"
                EnumerateCollection(Request.Params)
            Case "cookies"
                EnumerateCollection(Request.Cookies)
            Case "session"
                EnumerateCollection()
        End Select
    End Sub
    Private Sub EnumerateCollection()
        Dim x As String
        Response.Write("<TABLE border=1>")
        For Each x In Session.Keys
            Response.Write("<TR>")
            Response.Write("<TD>")
            Response.Write(x)
            Response.Write("</TD>")
            Response.Write("<TD>&nbsp;")
            Response.Write(Session.Item(x))
            Response.Write("</TD>")
            Response.Write("</TR>")
        Next
        Response.Write("</TABLE>")
    End Sub
    Private Sub EnumerateCollection(ByVal coll As System.Web.HttpCookieCollection)
        Dim x As String
        Response.Write("<TABLE border=1>")
        For Each x In coll.AllKeys
            Response.Write("<TR>")
            Response.Write("<TD>")
            Response.Write(x)
            Response.Write("</TD>")
            Response.Write("<TD>&nbsp;")
            Response.Write(coll(x).Value)
            Response.Write("</TD>")
            Response.Write("</TR>")
        Next
        Response.Write("</TABLE>")
    End Sub
    Private Sub EnumerateCollection(ByVal coll As System.Collections.Specialized.NameValueCollection)
        Dim x As String
        Response.Write("<TABLE border=1>")
        For Each x In coll
            Response.Write("<TR>")
            Response.Write("<TD>")
            Response.Write(x)
            Response.Write("</TD>")
            Response.Write("<TD>&nbsp;")
            Response.Write(coll(x))
            Response.Write("</TD>")
            Response.Write("</TR>")
        Next
        Response.Write("</TABLE>")
    End Sub
</script>
<HTML>
    <HEAD>
        <title>Show the different collections</title>
    </HEAD>
    <body>
         <form id="Form1" method="post" runat="server">
        <asp:dropdownlist id="ddList" runat="server" Width="176px" style="Z-INDEX: 101; LEFT: 16px; POSITION: absolute; TOP: 16px" OnSelectedIndexChanged=ddList_SelectedIndexChanged></asp:dropdownlist>
         </form>
    </body>
</HTML>

Is you browse this page, you will see a drop down as follows... select any option and it will list you all the different values of that collection.

 Output

Hope that helps,
Rahul

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Comments

  • Anonymous
    July 17, 2007
    <a href="http://blogs.msdn.com/" rel="follow" style="display:none;">Blogs</a> Thanks it was useful

  • Anonymous
    July 17, 2007
    Just enable ASP.NET tracing foe the page and it will show you all this information

  • Anonymous
    July 17, 2007
    The comment has been removed

  • Anonymous
    July 27, 2007
    You can enable tracing on the page level as well and that will ensure that appdomain does not recycle and niether will it cause memory issue.

  • Anonymous
    July 28, 2007
    Absolutely true! But in that case, won't it show all the stuff in the page itself? Knowing how you can get it programmatically won't hurt I guess :) You can log it in any file for later analysis as well!