Hi i have the following code into the aspx file and cs file, the content is dynamically come into the gridPanel

<ext:Hidden ID="Hidden1" runat="server" IDMode="Static" />
<ext:GridPanel ID="GridPanel1" runat="server" Layout="AnchorLayout" AnchorHorizontal="100%"
Padding="5" AnimCollapse="true" AutoScroll="true" Width="860" AutoHeight="true" IDMode="Static">
<ColumnModel ID="ColumnModel1" runat="server">
<Columns>
</Columns>
</ColumnModel>
<View>
<ext:GridView ID="GridView1" runat="server" TrackOver="true" />
</View>
<TopBar>
<ext:Toolbar ID="Toolbar1" runat="server">
<Items>
<ext:ToolbarFill ID="ToolbarFill1" runat="server" />



<ext:Button ID="Button2" runat="server" Text="To Excel" AutoPostBack="true" OnClick="ToExcel" Icon="PageExcel">
<Listeners>
<Click Fn="saveData" />
</Listeners>
</ext:Button>

<ext:Button ID="Button9" runat="server" Text="Submit with values">
<DirectEvents>
<Click OnEvent="SubmitSelection" Method="POST" Type="Submit">
<ExtraParams>
<ext:Parameter Name="Values" Value="Ext.encode(#{GridPanel1}.getRowsValues({ selectedOnly: false }))" Mode="Raw" />
</ExtraParams>
</Click>
</DirectEvents>
</ext:Button>

</Items>
</ext:Toolbar>
</TopBar>
</ext:GridPanel>


and in the CS code:
[DirectMethod]
protected void SubmitSelection(object sender, DirectEventArgs e)
{
string json = e.ExtraParams["Values"];
json.ToString();
StoreSubmitDataEventArgs eSubmit = new StoreSubmitDataEventArgs(json, null);
XmlNode xml = eSubmit.Xml;
//XmlNode xml = JsonConvert.DeserializeXmlNode("{records:{record:" + json + "}}");

this.Response.Clear();
this.Response.ContentType = "application/vnd.ms-excel";
this.Response.AddHeader("Content-Disposition", "attachment; filename=submittedData.xls");

XslCompiledTransform xtExcel = new XslCompiledTransform();

xtExcel.Load(Server.MapPath("Excel.xsl"));
xtExcel.Transform(xml, null, this.Response.OutputStream);
this.Response.End();
}

This code is work nicely for the Normal Excel Export. but, it give error for DirectEvents Call!!
Status Code: 200
Status Text: BADRESPONSE: xmlData is null


any Idea?? Thanks..