使用c#导出到Excel（在webapplication中）

我已经完成了从Gridview到Excel工作表的导出到Excel代码。我有下载对话框。如何通过点击“取消”按钮获取按钮值，无论是保存/下载数据还是关闭对话框

我想在“下载”对话框中确定挂接的按钮是“保存”还是“取消”

代码：

公共void导出（GridView GridView1，DataTable dtGuid） {

---

您需要提供代码。是否调用返回DialogResult的ShowDialog（），请检查DialogResult.OK

        string attachment = "attachment; filename=ScratchcardDetails.xls";

        Response.ClearContent();

        Response.AddHeader("content-disposition", attachment);

        Response.ContentType = "application/ms-excel";


        StringWriter sw = new StringWriter();

        HtmlTextWriter htw = new HtmlTextWriter(sw);
        GridView1.AllowPaging = false;
        GridView1.Visible = true;
        GridView1.DataSource = dtGuid;
        GridView1.DataBind();


        // Create a form to contain the grid

        HtmlForm frm = new HtmlForm();
        this.GridView1.Parent.Controls.Add(frm);
        frm.Attributes["runat"] = "server";
        frm.Controls.Add(this.GridView1);
        frm.RenderControl(htw);
        //Response.Write(style);
        Response.Write(sw.ToString());
        Response.End();


}

SaveFileDialog sfd = new SaveFileDialog();
if (sfd.ShowDialog() == DialogResult.OK)
{
    // Save hit
}