How to persist anon user selection (ex: theme selection)

Question

Sorry for the ambiguous question but here I go.

On each page a have a partial view displaying different theme options. These themes are just different css classes fo

Answer 1

You could use a concept known as Profile

With profiles you can declare the properties you would like to expose to your users and this works for anonymous users

Basically the profile properties are stored in cookies, therefore you can configure when they should expire and other cookies-related settings

Your profile properties are compiled as part of the top-level items compilation - AKA Compilation Life-Cycle in ASP.Net, therefore they will be exposed as strongly-typed properties through the Profile class

For example:

Web.config settings

<configuration>
  <system.web>
    <anonymousIdentification enabled="true"/>
    <profile defaultProvider="AspNetSqlProfileProvider" enabled="true">
      <properties>
        <add name="FirstName"/>
        <add name="LastName"/>
        <add allowAnonymous="true" name="LastVisit" type="System.Nullable`1[System.DateTime]"/>
        <group name="Address">
          <add name="Street"/>
          <add name="PC"/>
          <add name="InternalNumber" type="System.Int32" defaultValue="0"/>
        </group>
        <add name="EmployeeInfo" serializeAs="Binary" type="EmployeeInfo"/>
      </properties>
    </profile>
  </system.web>
</configuration>

Consuming the profile in code (Global.asax for this example)

void Application_EndRequest(object sender, EventArgs e)
{
    if (Profile != null)
    {
        Profile.LastVisit = DateTime.Now;
        Profile.Save();
    }
}

Additionally, ASP.Net lets you access the properties in JavaScript, using Microsoft AJAX components:

Web.config

<configuration>
  <system.web.extensions>
    <scripting>
      <webServices>
        <profileService enabled="true" readAccessProperties="LastVisit" writeAccessProperties="LastVisit"/>
        <jsonSerialization maxJsonLength="102400" recursionLimit="100" />
      </webServices>
    </scripting>
  </system.web.extensions>
</configuration>

ASPX

<script type="text/javascript" src="Scripts/jquery-1.7.2.min.js"></script>
<script type="text/javascript">
    $(function () {
        $("#profile").click(function () {
            Sys.Services.ProfileService.load();
            Sys.Services.ProfileService.properties.LastVisit = new Date();
            Sys.Services.ProfileService.save(
                null,
                function (m) {
                    alert(m);
                },
                function (e) {
                    alert(e);
                },
                null
            );
        });

        Sys.Services.ProfileService.load(null, function (r) {
            $("#res").append("<br/>");
            $("#res").append(Sys.Services.ProfileService.properties.LastVisit.toString());
            $("#res").append("<br/>");
        }, function (m) {
            $("#res").append(m.get_message());
        }, null);

    });
</script>

<asp:ScriptManager runat="server" ID="sm">
    <AuthenticationService />
    <ProfileService />
    <RoleService />
</asp:ScriptManager>