Kill Session when Clicking logout

Question

Hello Everyone,, Help me to kill the session when clicking logout. Heres the code


For CS

protected void lnkLogOut_Click(object sender, EventArgs e)
        {
           
            CLMSDataContext context = new CLMSDataContext();
            try
            {
                Object uid = Session["User_Idx"];

                Dim_User usr = context.Dim_Users.Single(u => u.User_Idx == Convert.ToInt32(uid));

                Session["User_Idx"] = null;
                Session["fullname"] = null;
                Session["errorlog"] = null;
                Session.Clear();

                //usr.Status = null;
                context.SubmitChanges();

                Response.Redirect("~/Login.aspx");
                Server.Transfer("Login.aspx");
            }
            catch (Exception ex)
            {
                Response.Write(ex.Message);
            }
            finally
            {
                context.Dispose();
            }
        }

For ASPX

<div class="SubFont">
          <%
              if (Session["User_Idx"] == null)
              {
                  Response.Redirect("Login.aspx");             
              }         
             else
             {
          %>
                <span>Welcome <% Response.Write(Session["Fullname"]); %> | </span>
                <asp:LinkButton runat="server" ID="lnkLogOut" Text="Logout"
                    onclick="lnkLogOut_Click" CssClass="ViewLive"></asp:LinkButton>
            <%}%>
</div>