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<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<appSettings>
<add key="IP" value="127.0.0.1" />
<add key="Database" value="police" />
<add key="username" value="sa" />
<add key="password" value="123456" />
</appSettings>
</configuration>
using System.Configuration;
string str1 = ConfigurationSettings.AppSettings["IP"];
string str2 = ConfigurationSettings.AppSettings["Database"];
string str3 = ConfigurationSettings.AppSettings["username"];
string str4 = ConfigurationSettings.AppSettings["password"];
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<appSettings>
<add key="IP" value="127.0.0.1" />
<add key="Database" value="police" />
<add key="username" value="sa" />
<add key="password" value="123456" />
</appSettings>
</configuration>