写在CONFIG文件中,然后从CONFIG文件中读取
<....
<appSettings>
<add key="constr" value="user id=sa;data source=XQ-Server;persist security info=False;initial catalog=XiQu"/>
</appSettings>
...>
string strConn=System.Configuration.ConfigurationSettings.AppSettings["constr"].ToString();
<....
<appSettings>
<add key="constr" value="user id=sa;data source=XQ-Server;persist security info=False;initial catalog=XiQu"/>
</appSettings>
...>
string strConn=System.Configuration.ConfigurationSettings.AppSettings["constr"].ToString();
都比较简单.