程序代码：

     (1)数据备份语句：backup database  数据库名 to disk='保存路径\db_Name.bak'
     (2)数据恢复语句：restore database 数据库名 from disk='保存路径\db_Name.bak'   WITH MOVE 'dbName_Data' TO 'c:\tcomcrm20041217.mdf', --数据文件还原后存放的新位置


         //数据库备份
         private void btnBak_Click(object sender, EventArgs e) //备份
        {
            string saveAway = this.tbxBakLoad.Text.ToString().Trim();
            string cmdText = @"backup database " + System.Configuration.ConfigurationSettings.AppSettings["dbName"] + " to disk='" + saveAway + "'";
            BakReductSql(cmdText,true);           
        }
        //数据库还原
        private void btnReduct_Click(object sender, EventArgs e)  //还原
        {
            string openAway = this.tbxReductLoad.Text.ToString().Trim();//读取文件的路径
            string cmdText = @"restore database " + System.Configuration.ConfigurationSettings.AppSettings["dbName"] + " from disk='" + openAway + "'";           
            BakReductSql(cmdText,false);
        }
        /// <summary>
        /// 对数据库的备份和恢复操作，Sql语句实现
        /// </summary>
        /// <param name="cmdText">实现备份或恢复的Sql语句</param>
        /// <param name="isBak">该操作是否为备份操作，是为true否，为false</param>
        private void BakReductSql(string cmdText,bool isBak)
        {
            SqlCommand cmdBakRst = new SqlCommand();
            SqlConnection conn = new SqlConnection("Data Source=.;Initial Catalog=master;uid=sa;pwd=;");
            try
            {
                conn.Open();
                cmdBakRst.Connection = conn;
                 = CommandType.Text;
                if (!isBak)     //如果是恢复操作
                {
                    string setOffline = "Alter database GroupMessage Set Offline With rollback immediate ";
                    string setOnline = " Alter database GroupMessage Set Online With Rollback immediate";
                     = setOffline + cmdText + setOnline;
                }
                else
                {
                     = cmdText;
                }
                cmdBakRst.ExecuteNonQuery();
                if (!isBak)
                {
                    MessageBox.Show("数据库还原成功", "系统消息");
                }
                else
                {
                    MessageBox.Show("备份成功", "系统消息");
                }
            }
            catch (SqlException sexc)
            {
                MessageBox.Show("操作失败");
            }
            catch (Exception ex)
            {
                MessageBox.Show("操作失败");
            }
            finally
            {
                cmdBakRst.Dispose();
                conn.Close();
                conn.Dispose();
            }
        }