在还原之前先执行这个存储过程，需要传递dbname，就是你的数据库的名字。下边是类的原代码：（web.config里的数据库连接字符串是constr）
 

using System;

using System.Configuration;

using System.Data.SqlClient;

using System.Data;

namespace web.base_class

{

     /// <summary>

     /// DbOper类,主要应用SQLDMO实现对Microsoft SQL Server数据库的备份和恢复

     /// </summary>

     public class DbOper

     {

          private string server;

          private string uid;

          private string pwd;

          private string database;

          private string conn;

         /// <summary>

         /// DbOper类的构造函数

         /// </summary>

         public DbOper()

         {

              conn=System.Configuration.ConfigurationSettings.AppSettings["constr"].ToString();

              server=cut(conn,"server=",";");

              uid=cut(conn,"uid=",";");

              pwd=cut(conn,"pwd=",";");

              database=cut(conn,"database=",";");

         }

         public string cut(string str,string bg,string ed)

         {

              string sub;

              sub=str.Substring(str.IndexOf(bg)+bg.Length);

              sub=sub.Substring(0,sub.IndexOf(";"));

              return sub;

         }

         /// <summary>

         /// 数据库备份

         /// </summary>

         public  bool DbBackup(string url)

         {

              SQLDMO.Backup oBackup = new SQLDMO.BackupClass();

              SQLDMO.SQLServer oSQLServer = new SQLDMO.SQLServerClass();

              try

              {

                   oSQLServer.LoginSecure = false;

                   oSQLServer.Connect(server,uid, pwd);

                   oBackup.Action = SQLDMO.SQLDMO_BACKUP_TYPE.SQLDMOBackup_Database;

                   oBackup.Database = database;

                   oBackup.Files = url;//"d:\Northwind.bak";

                   oBackup.BackupSetName = database;

                   oBackup.BackupSetDescription = "数据库备份";

                   oBackup.Initialize = true;

                   oBackup.SQLBackup(oSQLServer);

                   return true;

              }

              catch

              {

                   return false;

                   throw;

              }

              finally

              {

                   oSQLServer.DisConnect();

              }

         }

         /// <summary>

         /// 数据库恢复

         /// </summary>

         public string DbRestore(string url)

         {

              if(exepro()!=true)//执行存储过程

              {

                   return "操作失败";

              }

              else

              {

                   SQLDMO.Restore oRestore = new SQLDMO.RestoreClass();

                   SQLDMO.SQLServer oSQLServer = new SQLDMO.SQLServerClass();

                   try

                   {

                        oSQLServer.LoginSecure = false;

                        oSQLServer.Connect(server, uid, pwd);

                        oRestore.Action = SQLDMO.SQLDMO_RESTORE_TYPE.SQLDMORestore_Database;

                        oRestore.Database = database;

                        oRestore.Files = url;//@"d:\Northwind.bak";

                        oRestore.FileNumber = 1;

                        oRestore.ReplaceDatabase = true;

                        oRestore.SQLRestore(oSQLServer);

                       return "ok";

                   }

                   catch(Exception e)

                   {

                       return "恢复数据库失败";

                       throw;

                   }

                   finally

                   {

                        oSQLServer.DisConnect();

                   }

              }

         }

          private bool exepro()

         {

              SqlConnection conn1 = new SqlConnection("server="+server+";uid="+uid+";pwd="+pwd+";database=master");

              SqlCommand cmd = new SqlCommand("killspid",conn1);

              cmd.CommandType = CommandType.StoredProcedure;

              cmd.Parameters.Add("@dbname","port");

              try

              {

                   conn1.Open();

                   cmd.ExecuteNonQuery();

                   return true;

              }

              catch(Exception ex)

              {

                   return false;

              }

              finally

              {

                   conn1.Close();

              }

         }

     }

}