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<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<connectionStrings>
<add name="strConnection"
providerName="System.Data.SqlClient"
connectionString="Data Source=.\sqlexpress;AttachDBFilename=|DataDirectory|\mydb1.mdf;Integrated Security=True;User Instance=True"/>
</connectionStrings>
</configuration>
string constr = ConfigurationManager.ConnectionStrings["strConnection"].ConnectionString;
using (SqlConnection conn = new SqlConnection(constr))
{
conn.Open();
Console.WriteLine("打开数据库连接成功");
}