or

CS:<asp:LinkButtonID="ExportToExcel"ToolTip="Export to Excel"runat="server"Text="Export To Excel"CommandName="Export"OnClick="ExportToExcel_Click"/>
protected void ExportToExcel_Click(object sender, EventArgs e) { RadGrid.ExportSettings.FileName = "filename"; RadGrid.ExportSettings.IgnorePaging = true; RadGrid.ExportSettings.ExportOnlyData = true; RadGrid.ExportSettings.OpenInNewWindow = true; RadGrid.MasterTableView.UseAllDataFields = true; RadGrid.ExportSettings.Excel.Format = GridExcelExportFormat.ExcelML; RadGrid.MasterTableView.HierarchyDefaultExpanded = true; // first level RadGrid.MasterTableView.DetailTables[0].HierarchyDefaultExpanded = true; // second level RadGrid.MasterTableView.ExportToExcel(); }