20210122_webform_sample.cs

// 下載檔案
protected void btnDownload_Click(object sender, EventArgs e)
{
    var fileBytes = Encoding.UTF8.GetBytes("Hello, World!");

    Response.ClearContent();
    Response.ClearHeaders();
    Response.ContentType = "text/plain";
    Response.AppendHeader("Content-Disposition", 
        JZLib.HeaderUtil.GetUnicodeContentDisposition("測試中文.txt", false));
    Response.BinaryWrite(fileBytes);
    Response.End();
}