在linq中实现增删改查功能的示例

     public class CustomerModel  
    {
    
    	//获取web.config中的数据库连接  
        private static string con = ConfigurationManager.AppSettings["ConnectionString"];  
        private DataClassDataContext dc = new DataClassDataContext(con);  
        /// <summary>  
        /// 分页查询客户信息  
        /// </summary>  
        /// <param name="customer">客户代码</param>  
        /// <param name="PageSize">每页显示数据条数</param>  
        /// <param name="PageIndex">第几页</param>  
        /// <param name="id">客户id</param>  
        /// <returns></returns>  
        public string QueryCustomer(string customer