database.cs

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using System;
using System.Configuration;
using System.Data.SqlClient;
using BookManage.Model;

namespace BookManage.DAL
{
    /// <summary>
    ///  使用SQL Server托管提供者进行ADO.NET数据连接
    /// </summary>
    public class Database
    {
        /// <summary>
        /// 创建一个SqlConnetion实例
        /// </summary>
        /// <returns></returns>
        public SqlConnection CreateSqlConnection()
        {
            SqlConnection con;
            string connectionString = ConfigurationManager.AppSettings["ConnectionString"].ToString();
            con = new SqlConnection(connectionString);
            return con;
        }

    }
}