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ASP.NET Ajax History not working correctly
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
    <Triggers>
        <asp:AsyncPostBackTrigger ControlID="LinkButton1" EventName="Click"/>
        <asp:AsyncPostBackTrigger ControlID="LinkButton2" EventName="Click"/>
        <asp:AsyncPostBackTrigger ControlID="LinkButton3" EventName="Click"/>
    </Triggers>
    <ContentTemplate>
        <asp:PlaceHolder ID="PlaceHolder1" runat="server" Visible="false">
        </asp:PlaceHolder>
    </ContentTemplate>
</asp:UpdatePanel>

LoadControls("ControlName");

Session["current"]

<asp:ScriptManager ID="ScriptManager" runat="server" EnableHistory="True" onnavigate="ScriptManager_Navigate" />

string ControlId=Session["current"].ToString();

if (ScriptManager.IsInAsyncPostBack && !ScriptManager.IsNavigating)
{
    ScriptManager.AddHistoryPoint("Hist", ControlId);
}

protected void ScriptManager_Navigate(object sender, HistoryEventArgs e)
    {
        string Controlid = "";
        if (e.State["index"] != null)
        {
            Controlid = e.State["Hist"].ToString();
            LoadControls(Controlid );
        }
    }