Use a web. config file in asp.net

I haven't written a blog for a long time, so I can't discard it.
If you want to write something, I suddenly forgot how to use connectionstring in the web. config file at work today.
I believe that my friends with asp.net experience will use configuration files to store database information,
Let me write the assignment of the connection string in web. config.
<ConnectionStrings>
<Add name = "JKXTConnectionString" connectionString = "Data Source = CHF; Initial Catalog = JKXT; User ID = sa" providerName = "System. Data. SqlClient"/>
<Add name = "JGXTConnectionString" connectionString = "Data Source = CHF; Initial Catalog = JGXT; User ID = sa" providerName = "System. Data. SqlClient"/>
</ConnectionStrings>
The method is as follows:
ConfigurationManager. ConnectionStrings ["JGXTConnectionString"]. ConnectionString;

Or write web. config in this way.
<Deleetask>
<Add key = "connectionstring" value = "Data Source = CHF; Initial Catalog = JGXT; User ID = sa"/>
</AppSettings>
The method is as follows:
ConfigurationSettings. deleettings ["JGXTConnectionString"];

Remember. You need to reference using System. Configuration;