恢复数据库：
  关键字：Alter Database 被恢复的数据库名 Set Offline with Rollback immediate;
            restore database 被恢复的数据库名 from disk = '备份文件路径';
            Alter Database 被恢复的数据库名 Set OnLine With rollback Immediate;

/////////////////////
    string sql = "Alter Database db Set Offline with Rollback immediate;"; //db 是要备份的数据库名
    sql +=  "restore database db from disk = '" ;
    sql += Server.MapPath("").ToString() +"\\";
    sql += bakname + "'";  //bakname 是备份文件名
    sql += "Alter Database db Set OnLine With rollback Immediate;";
    try
    {
     连接 master 数据库 ;
     执行 sql  语句;
     Response.Write("<script language=javascript>alert('数据恢复成功！');</script>");
    }
    catch(Exception ex)
    {
     Response.Write("<script language=javascript>alert('数据恢复失败！');</script>");
     this.Label2.Text = ex.ToString();
    }

备份数据库：

关键字：backup database 被备份的数据库名 to disk ='备份文件路径';
//////////////////////     
 string sql = "backup database db to disk = '" + Server.MapPath("").ToString() +"\\"
    + bakname  //备份文件名 
    + System.DateTime.Now.DayOfYear.ToString() 
    + System.DateTime.Now.Millisecond.ToString() + ".bak'";
   Database data = new Database();
   data.oper_data(sql);
   Response.Write("<script language=javascript>alert('备份成功！');location='restore.aspx'</script>");

------解决方案--------------------
备份数据库感觉是就是写sql语句,在执行就ok了.  顶楼上

------解决方案--------------------
第一种方式
-- Start 备份数据
DECLARE @dateString nvarchar(255);
SET @dateString = N'D:\Web\DB_back\cpgz_UniProfile\cpgz_UniProfile_' + CONVERT(varchar,DATEADD(Day,0,GETDATE()),112) + '.bak'
BACKUP DATABASE cpgz_UniProfile
TO DISK = @dateString WITH NOFORMAT, INIT, NAME = N'ODS_Central-完整 数据库 备份', SKIP, NOREWIND, NOUNLOAD,  STATS = 10
GO
-- end 备份数据

-- Start 删除3天前的备份文件
declare @d Nvarchar(256);
set @d ='del D:\Web\DB_back\cpgz_UniProfile\cpgz_UniProfile_' + convert(varchar,dateadd(day,-3,getdate()),112) + '.bak';
exec master..xp_cmdshell @d
-- end


第二种方试
-- Start 自动备份：
declare @time nvarchar(100)
declare @RuJing nvarchar(100)
set @time=CONVERT(varchar(100), GETDATE(), 112)
set @RuJing='D:\Web\DB_back\cpgz_UniProfile\cpgz_UniProfile_'+@time+'.bak'
Backup database cpgz_UniProfile to  
disk=@RuJing
-- end 自动备份