c#实现文件写入数据表/以二进制流保存到数据库，并实现下载

上传：

1、上传文件先保存到服务器   File.SaveAs(path)

2、sql（文件和sql在一个服务器上）进行保存操作：

insert into File(filename,filebody)

values('长大了是否.txt',(SELECT * FROM OPENROWSET(BULK '" + path + "',SINGLE_BLOB) AS x))

下载：

if (reader.Read())

Response.Clear();
String strFileName = reader["oldname"].ToString();
Response.ContentType = "APPLICATION/OCTET-STREAM";
Response.AddHeader("content-disposition", "attachment;filename=" + HttpUtility.UrlEncode(strFileName));
Response.Buffer = true;
Response.BinaryWrite((byte[])reader["filecontent"]);