Use Package Config DB Connection string in Script Task

I tried way 1 below but connection returned was null.
So I got the ConnectionString as Way 2 below and tried to create new connection
Way 1:
connection = new SqlConnection();
connection = (SqlConnection)(Dts.Connections["Restrc_dbconn"].AcquireConnection(Dts.Transaction) as SqlConnection);
Way 2:
string connString = Dts.Connections["Restrc_dbconn"].ConnectionString;
connection = new SqlConnection(connString); 

This gives me error saying "Keyword not supported :Provider"

The steps I tried above does not use Package Config. Can someone please help me how to use it. And i f I use Package Config, the connection string in that also would have Provider so how can we overcome the Provider keyword error.

Thanks In Advance!!