(
NameValueCollection)ConfigurationManager.GetSection("applicationSettings/ConnectionStrings");for the following XML fragment in the config file:-
<applicationSettings>
<ConnectionStrings>
<add key="DevConnectionstring" value="server=myserver1;database=mydatabase;uid=ashish;pwd=password"/>
<add key="QAConnectionstring" value="server=myserver2;database=mydatabase;uid=ashish;pwd=password"/>
<add key="ProdConnectionstring" value="server=myserver3;database=mydatabase;uid=ashish;pwd=password"/>
</ConnectionStrings>
</applicationSettings>