or
bool isExport = false;protected void Button1_Click(object sender, EventArgs e){ Session["SelectedItems"] = RadGrid1.SelectedItems; isExport = true; RadGrid1.ExportSettings.IgnorePaging = true; RadGrid1.ExportSettings.UseItemStyles = true; RadGrid1.ExportSettings.ExportOnlyData = true; RadGrid1.MasterTableView.ExportToExcel();}protected void RadGrid1_PreRender(object sender, EventArgs e){ if (isExport) { foreach (GridDataItem item in RadGrid1.MasterTableView.Items) { item.Expanded = true; } }}<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="window.aspx.vb" Inherits="TestaTredjepartWeb.window" %><!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 runat="server"> <title></title></head><body> <form id="form1" runat="server"> <asp:ScriptManager ID="s" runat="server"> </asp:ScriptManager> <div> <telerik:RadWindowManager ID="RadWindowManager1" runat="server"> <Windows> <telerik:RadWindow ID="RadWindow1" runat="server" VisibleOnPageLoad="true" AutoSize="true" RenderMode="Lightweight" Title="Hello"> <ContentTemplate> Some content </ContentTemplate> </telerik:RadWindow> </Windows> </telerik:RadWindowManager> </div> </form></body></html>