protected void Button1_Click(object sender, EventArgs e)
{
    string url = Server.MapPath("/img/image.png");
    FileInfo file = new FileInfo(url);
    Response.ContentType = "image/png";
    Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode("优惠券.png", System.Text.Encoding.UTF8));
    Response.WriteFile(url);
    Response.Flush();
}

 

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