C#备份和下载数据库

备份：

using (var conn = new SqlConnection(Firstelite.OMS.Business.Comman.SQLHelper.ConnectionString))
        {
            conn.Open();
            var sql = @"BACKUP DATABASE SMSUIALL
              TO DISK = 'D:SMSUIALL.bak'
                 WITH FORMAT,
                    MEDIANAME = 'SQLServerBackups',
                    NAME = ''";
            var cmd = new SqlCommand(sql,conn);
            cmd.CommandTimeout = 300;
            cmd.ExecuteNonQuery();
        }

下载：

using (var conn = new SqlConnection(Firstelite.OMS.Business.Comman.SQLHelper.ConnectionString))
        {
            conn.Open();
            var sql = @"
              DECLARE @data VARBINARY(MAX)
              SELECT @data = BulkColumn
              FROM OPENROWSET(BULK 'D:SMSUIALL.bak', SINGLE_BLOB) MyFile
              SELECT @data";
            var cmd = new SqlCommand(sql,conn);
            cmd.CommandTimeout = 300;
            var data = (byte[])cmd.ExecuteScalar();
            File.WriteAllBytes(@"D:publishSMSUIALL.bak",data);
        }

 实例中数据库和网站不在同一台服务器上，所以说是下载。