练习：WinForm--DataGridView增删改查完整版

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data.SqlClient;

namespace DataGridView增删改查完整版.DataConnection
{
    public class DataConnection
    {
        private static string connstr = "server=.; database=mydb; user=sa; pwd=ray; ";
        public static SqlConnection Conn
        {
            get { return new SqlConnection(connstr); }
        }
    }
}

DataConnection