protected void Page_Load(object sender, EventArgs e)
        {
            if (!this.Page.IsPostBack)
            {
                Session.Clear();
            }
        }

public class BaseController : Controller
    {
        protected override void Initialize(System.Web.Routing.RequestContext requestContext)
        {
            base.Initialize(requestContext);

            requestContext.HttpContext.Response.Expires = 0;
            requestContext.HttpContext.Response.Cache.SetNoStore();
            requestContext.HttpContext.Response.AppendHeader("Pragma", "no-cache");
            if (SessionManager.UserEmail == string.Empty)
            {
                BindData(); //set all sessions here
            }
            else {
                BindNavigation(SessionManager.UserRoleID);
            }
        }

@Html.ActionLink((String)ViewBag.NavAllAck

<trust level="Full" originUrl="" legacyCasModel="false" />
             <compilation debug="true" targetFramework="4.0" />
    <customErrors mode="Off" />
    <authorization>
    <allow users="*" />
    <allow users="?" />
  </authorization>

    <pages enableSessionState="true">
      <controls>
      </controls>
      <namespaces>
        <add namespace="System.Web.Helpers" />
        <add namespace="System.Web.Mvc" />
        <add namespace="System.Web.Mvc.Ajax" />
        <add namespace="System.Web.Mvc.Html" />
        <add namespace="System.Web.Routing" />
        <add namespace="System.Web.WebPages" />
      </namespaces>
    </pages>

    <httpModules>
      <add name="CuteWebUI.UploadModule" type="CuteWebUI.UploadModule,CuteWebUI.AjaxUploader"/>
         <add name="Session" type="System.Web.SessionState.SessionStateModule" />
    </httpModules>

  </system.web>
    <system.webServer>
    <validation validateIntegratedModeConfiguration="false" />
    <modules runAllManagedModulesForAllRequests="true" >
        <remove name="Session" />
            <add name="Session" type="System.Web.SessionState.SessionStateModule" preCondition="" />
    </modules>