Hello,
I'm trying to pass the value of tab (param BE) that is clicked to show up in a grid inside RadPageView2.  For example:
Tab A and B
when Tab A is clicked, i would like the grid to come up using SqlDataSource2 with the BE field = 'A'.

Can someone help?

Thanks

<%@ Page Language="C#" MasterPageFile="Public.master" AutoEventWireup="true" CodeFile="Sample.aspx.cs" Inherits="_Default" Debug="true" %>

<%

@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>

asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">

DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

html xmlns="http://www.w3.org/1999/xhtml">

<

head>

<title>Sample</title>

</

head>

<

body>

<form id="form1" runat="server">

<div><asp:scriptmanager runat="server" id="ScriptManager1">

</asp:scriptmanager>

<telerik:RadAjaxManager ID="RadAjaxManager1" runat="server">

<AjaxSettings>

<telerik:AjaxSetting AjaxControlID="RadGrid1">

<UpdatedControls>

<telerik:AjaxUpdatedControl ControlID="RadGrid1" LoadingPanelID="RadAjaxLoadingPanel1" />

<telerik:AjaxUpdatedControl ControlID="RadWindowManager1" />

<telerik:AjaxUpdatedControl ControlID="lbl_message" />

</UpdatedControls>

</telerik:AjaxSetting>

</AjaxSettings>

</telerik:RadAjaxManager>

<br />

<telerik:RadTabStrip ID="RadTabStrip1" runat="server" AutoPostBack="true" MultiPageID="RadMultiPage1"

DataSourceID="SqlDataSource1" DataTextField="peo" >

</telerik:RadTabStrip>

<telerik:RadMultiPage ID="RadMultiPage1" runat="server">

<telerik:RadPageView ID="PageView1" runat="server">

<telerik:RadGrid ID="RadGrid1" DataSourceID="SqlDataSource1" runat="server">

</telerik:RadGrid>

</telerik:RadPageView>

<telerik:RadPageView ID="RadPageView2" runat="server">

<telerik:RadGrid ID="RadGrid2" DataSourceID="SqlDataSource2" runat="server">

</telerik:RadGrid>

</telerik:RadPageView>

</telerik:RadMultiPage>

<asp:SqlDataSource ID="SqlDataSource1"

ConnectionString="<%$ ConnectionStrings:ConnectionString2 %>" runat="server"

SelectCommand="SELECT BE FROM Projects WHERE (FY = @FY) AND ([BA] = @BA) GROUP BY BE">

<SelectParameters>

<asp:QueryStringParameter Name="FY" QueryStringField="FY" Type="String" />

<asp:QueryStringParameter Name="BA" QueryStringField="BA" Type="String" />

</SelectParameters>

</asp:SqlDataSource>

<asp:SqlDataSource ID="SqlDataSource2"

ConnectionString="<%$ ConnectionStrings:ConnectionString2 %>" runat="server"

SelectCommand="SELECT * FROM [PROJECTS_INPUT] WHERE (([FY] = @FY) AND ([BA] = @BA) AND ([BE] = @BE)) ">

<SelectParameters>

<asp:SessionParameter Name="FY" SessionField="FY" Type="String" />

<asp:SessionParameter Name="BA" SessionField="BA" Type="String" />

<asp:SessionParameter Name="BE" SessionField="BE" Type="String" />
</SelectParameters>

</asp:SqlDataSource>

<telerik:RadAjaxPanel ID="RadAjaxPanel1" LoadingPanelID="RadAjaxLoadingPanel1" runat="server" Height="800px" Width="1000px">

<asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder>

</telerik:RadAjaxPanel>

</div>

</form>

</

body>

</

html>

</

asp:Content>

TargetFolder="~/dateien"
and 

TargetFolder="./dateien"

and also in code behind: 

rauUpload.TargetFolder = Server.MapPath("~/dateien");