public RadForm1()
        {
            InitializeComponent();

            this.radGridView1.Columns.Add("Telerik");
            this.radGridView1.AutoSizeColumnsMode = GridViewAutoSizeColumnsMode.Fill;
            for (int i = 0; i < 10; i++)
            {
                this.radGridView1.Rows.Add(Guid.NewGuid().ToString());
            }
        }

        private void radButton1_Click(object sender, EventArgs e)
        {
            RadPrintDocument document = new RadPrintDocument();
            document.DefaultPageSettings.Landscape = false;  
            this.radGridView1.PrintPreview(document);
        }