Get Connection String from Config file

When I was trying to access my connection string from class file using below code 
string con = ConfigurationSettings.ConnectionStrings["Conn"].ConnectionString;
I was getting below error.
'System.Configuration.ConfigurationSettings' does not contain a definition for 'ConnectionStrings'
After Google I came you with the solution below,
is obsolete. You need to use different class called ConfigurationManager to access information from the configuration file. To Access connection string, your code would look like
string con = System.Configuration.ConfigurationManager.ConnectionStrings["Conn"].ConnectionString


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