public RadForm1()
        {
            InitializeComponent();

            this.radGridView1.Columns.Add("Col");
            this.radGridView1.AutoSizeColumnsMode = GridViewAutoSizeColumnsMode.Fill;
            this.radGridView1.Rows.Add("First"+Environment.NewLine+"Second"+Environment.NewLine+"Third");

            this.radGridView1.AutoSizeRows = true;

        }

        private void radButton1_Click(object sender, EventArgs e)
        {
            string fileName = @"..\..\" + DateTime.Now.ToLongTimeString().Replace(":", "_") + ".xlsx";
            GridViewSpreadExport spreadExporter = new Telerik.WinControls.Export.GridViewSpreadExport(this.radGridView1)
            {
                ExportVisualSettings = true, 
                FileExportMode = Telerik.WinControls.Export.FileExportMode.NewSheetInExistingFile
            };
            SpreadExportRenderer exportRenderer = new Telerik.WinControls.Export.SpreadExportRenderer();
            spreadExporter.CellFormatting+=spreadExporter_CellFormatting;
            spreadExporter.RunExport(fileName, exportRenderer);
            Process.Start(fileName);
        }

        private void spreadExporter_CellFormatting(object sender, Telerik.WinControls.Export.CellFormattingEventArgs e)
        {
            e.CellStyleInfo.TextWrap = true;
        }