给打印加水印

using System.Drawing;
using DevExpress.XtraPrinting.Drawing;
using DevExpress.XtraReports.UI;
// ...

public void SetTextWatermark(XtraReport report){
// Adjust text watermark settings.
report.Watermark.Text = "CUSTOM WATERMARK TEXT";
report.Watermark.TextDirection = DirectionMode.ForwardDiagonal;
report.Watermark.Font = new Font(report.Watermark.Font.FontFamily, 40);
report.Watermark.ForeColor = Color.DodgerBlue;
report.Watermark.TextTransparency = 150;
report.Watermark.ShowBehind = false;
report.Watermark.PageRange = "1,3-5";
}

public void SetPictureWatermark(XtraReport report){
// Adjust image watermark settings.
report.Watermark.Image = Bitmap.FromFile("watermark.gif");
report.Watermark.ImageAlign = ContentAlignment.TopCenter;
report.Watermark.ImageTiling = false;
report.Watermark.ImageViewMode = ImageViewMode.Stretch;
report.Watermark.ImageTransparency = 150;
report.Watermark.ShowBehind = true;
report.Watermark.PageRange = "2,4";
}

private void XtraReport1_BeforePrint(object sender, System.Drawing.Printing.PrintEventArgs e) {
SetTextWatermark((XtraReport)sender);
}