各位大哥：
      初学使用 + C#开发环境，在使用SaveFileDialog时SaveFileDialog窗口不显示在WEB页面的上面，需要最小化当先使用的WEB页面才能看到SaveFileDialog窗口，请问有何办法让SaveFileDialog窗口直接显示在使用SaveFileDialog的WEB业务上面，非常感谢您的不吝赐教！

protected void Button1_Click(object sender, EventArgs e)
    {
        SaveFileDialog saveFileDialog1 = new SaveFileDialog();
        saveFileDialog1.Filter = "Txt文件(*.txt)|*.txt|EXCEL文件(*.xls)|*.xls|所有文件(*.*)|*.*";
        saveFileDialog1.FilterIndex=2;
        saveFileDialog1.DefaultExt = "xls";
        saveFileDialog1.AddExtension = true;
        saveFileDialog1.RestoreDirectory=true;
        saveFileDialog1.CreatePrompt = true;
        saveFileDialog1.ShowDialog();

        if ((saveFileDialog1.ShowDialog()) == DialogResult.OK)
        {
            if (saveFileDialog1.FileName != null)
            {
                fName = saveFileDialog1.FileName;
                File fSaveAs = new File(fName);
                isFileHaveName = true;
                fSaveAs.WriteFile(richTextBox1.Text);
            }
            else
            {
                MessageBox.Show("显示报错信息", "标题错误提示", MessageBoxButtons.OK);
            }
        }   
        saveFileDialog1.Dispose();
        saveFileDialog1 = null;
    }