无法在Chrome中打开下载的PDF文件

Question

这是我获取PDF文件的代码。当我尝试在chrome中打开下载的PDF文件时，出现错误对话框，并显示消息“无法加载PDF文档。”

if (!string.IsNullOrEmpty(FileName))
{
    var contentList = db.Output.Where(q => q.QID == id && q.FileName.Equals(FileName)).OrderBy(q => q.AQID).Select(q => q.TextValue).ToList();

    StringBuilder sb = new StringBuilder();
    for (int i = 0; i < contentList.Count; i++)
    {
        sb.AppendFormat("{0}", contentList[i]);
        //  Response.WriteFile();
    }
    var byteArray = Encoding.ASCII.GetBytes(sb.ToString());
    Response.AddHeader("Content-Disposition", "attachment; filename=\"" + FileName + "\"");
    Response.ContentType = "application/octet-stream";
    Response.BinaryWrite(byteArray);
    Response.End();
}