C#备份，还原数据库

     private void btnBack_Click(object sender, EventArgs e)
      {
          string saveAway = @"C:\1.bak";
          //            string cmdText = @"backup database " + System.Configuration.ConfigurationSettings.AppSettings["dbName"] + " to disk='" + saveAway + "'";
          string cmdText = @"backup database TestDemo to disk='" + saveAway + "'";
          BakReductSql(cmdText, true);
      }

      private void btnRestore_Click(object sender, EventArgs e)  //恢复
      {
          // string openAway = this.tbxReductLoad.Text.ToString().Trim();//读取文件的路径
          string openAway = @"c:\1.bak";//读取文件的路径
          //string cmdText = @"restore database " + System.Configuration.ConfigurationSettings.AppSettings["dbName"] + " from disk='" + openAway + "'";
          string cmdText = @"restore database TestDemo from disk='" + openAway + "' with REPLACE;";
          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=sa;");
          try
          {
              conn.Open();
              cmdBakRst.Connection = conn;
              cmdBakRst.CommandType = CommandType.Text;
              if (!isBak)     //如果是恢复操作
              {
                  string setOffline = "Alter database TestDemo Set Offline With rollback immediate ;";
                  string setOnline = " Alter database TestDemo Set Online With Rollback immediate;";
                  cmdBakRst.CommandText = setOffline + cmdText + setOnline;
              }
              else
              {
                  cmdBakRst.CommandText = cmdText;
              }
              cmdBakRst.ExecuteNonQuery();
              if (!isBak)
              {
                  MessageBox.Show("恭喜你，数据成功恢复为所选文档的状态！", "系统消息");
              }
              else
              {
                  MessageBox.Show("恭喜，你已经成功备份当前数据！", "系统消息");
              }
          }
          catch (SqlException sexc)
          {
              MessageBox.Show("失败，可能是对数据库操作失败，原因：" + sexc, "数据库错误消息");
          }
          catch (Exception ex)
          {
              MessageBox.Show("对不起，操作失败，可能原因：" + ex, "系统消息");
          }
          finally
          {
              cmdBakRst.Dispose();
              conn.Close();
              conn.Dispose();
          }
      }

备份文件保存在数据库服务器上