Question

I have an application that should connect to many databases on different servers.
What is the best way to code it?

Answer 1

By using multiple add tag with Different name inside ConnectionStrings tag you can provide multiple connection string in app.config.

<connectionStrings>
    <add name="name1" connectionString="Your connection1"  providerName="DataBaseProvider1" />
    <add name="name2" connectionString="Your connection2" providerName="DataBaseProvider2"  />
</connectionStrings>

To read connection string, use,

 string connection1 = System.Configuration.ConfigurationManager.ConnectionStrings["name1"].ConnectionString