小总结

1.String.IsNullOrEmpty(sID)
2. StringBuilder ss = new StringBuilder();
            foreach (string s in _oRemarkKeyList.Values)
                ss.Append("[").Append(s).Append("]");
            _sRemark = ss.ToString();
3.  DataRow dr = _oDishsSort.NewRow();
                    dr.ItemArray = new object[] { ALL_SORT_L, "00", "[所有分类]", 1 };
                    _oDishsSort.Rows.InsertAt(dr, 0);
4. oBut.Text = String.Format("{0}{1}\n\r  ￥{2}/{3}", _oDvDish[_iNoDish]["menu_cname"],
                            sSet,Convert.ToDouble(_oDvDish[_iNoDish]["price"]), _oDvDish[_iNoDish]["unit"]);
5. if (Convert.ToBoolean(_oDvDish[_iNoDish]["ifsuit"]))
                    sSet = "[套]";
6.DataRow oRow = (oDishBut.Tag as DataRow);
            if (oRow == null)
                return;
7. int i = this.flpanSelDish.Controls.IndexOf(oRBut);
检索控件集合中指定控件的索引
8。private List<DataRow> _oDvDish = new List<DataRow>();//通过索引访问
   private List<CSelDish> _oLstSelDish = new List<CSelDish>();
 Dictionary<string, string> _oRemarkKeyList = new Dictionary<string, string>();//键值集合
9。using System;
using System.Collections.Generic;
using System.Text;
using System.Collections;
using System.Data;

namespace MidasTouch
{
    /// <summary>
    /// 存储信息的类,用于各种信息
    /// </summary>
    public class DataInfo
    {
        private Hashtable _oDataInfo = new Hashtable();
        public DataInfo(DataRow oRow)
        {
            foreach (DataColumn oCol in oRow.Table.Columns)
            {
                _oDataInfo.Add(oCol.ColumnName, oRow[oCol]);
            }
        }
        /// <summary>
        /// 设置和获取该项的内容
        /// </summary>
        /// <param name="sName">项的名字</param>
        /// <returns>返回值</returns>
        public object this[string sName]
        {
            get
            {
                return _oDataInfo[sName];
            }
            set
            {
                _oDataInfo[sName] = value;
            }
        }
        /// <summary>
        /// 该信息的条数
        /// </summary>
        public int Count
        {
            get
            {
                return _oDataInfo.Count;
            }
        }
    }
}
12。
app.config
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <appSettings>
    <add key="ConnectionString" value="Data Source=Initial Catalog=YGCY;Data Source=KELVIN;;User ID=yg001"/>
  </appSettings>
</configuration>
连接字符串
        private string _sConnStr = System.Configuration.ConfigurationManager.AppSettings["ConnectionString"];
/// <summary>
        /// 连接数据库的连接串
        /// </summary>
        public string ConnStr
        {
            get
            {
                return _sConnStr;
            }
            set
            {
                _sConnStr = value;
            }
        }