ASP.NET遍历配置文件的连接字符串

public string GetConnectionString( string _connectionStringsName ) 
{ 
System.Configuration.ConnectionStringSettingsCollection 
config = System.Configuration.ConfigurationManager.ConnectionStrings; 
for (int i = 0 ; i < config.Count ; i++) 
{ 
if (config[i].Name.Equals(_connectionStringsName, StringComparison.OrdinalIgnoreCase)) 
return config[i].ToString(); 
} 
return String.Empty; 
} 

＜connectionStrings＞ 
＜add name="ConnectionString1" connectionString="Persist Security Info=False;
User ID=sa;Password=;Initial Catalog=DataBase1;Server=(local);
" providerName="System.Data.SqlClient"/＞ 
＜add name="ConnectionString2" connectionString="Persist Security Info=False;
User ID=sa;Password=;Initial Catalog=DataBase2;Server=(local);
" providerName="System.Data.SqlClient"/＞ 
＜/connectionStrings＞ 

string ConnectString = XianhuiMengUtil.GetConnectionString("ConnectionString1"); 

＜connectionStrings＞ 
＜add name="LocalSqlServer" connectionString="data source=.SQLEXPRESS;
Integrated Security=SSPI;AttachDBFilename=　DataDirectory　aspnetdb.mdf;
User Instance=true" providerName="System.Data.SqlClient" /＞ 
＜/connectionStrings＞