打印pdf文件时弹出对话框

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打印pdf代码：
      PrintInfo printInfo = new PrintInfo();
         printInfo.PrintToPdf = true;
         printInfo.PdfFileName = GetFileNameToExport(1);
         printInfo.PrintType = PrintType.CurrentPage;
         for (int i = 0; i < fpSpread1.Sheets.Count; i++) {
            fpSpread1.ActiveSheet.PrintInfo = printInfo;
         }
         fpSpread1.PrintSheet(-1);
触发导出事件时：
  file:///C:/Documents%20and%20Settings/yong%20fu/Desktop/1.png

弹出一个对话框，貌似我的PdfFileName属性无效！怎么不让对话框出来呢?