ADO.Net sql connection to a SQL Sever 2012

I have a sql server installed in my pc and I'm trying to get some help with the following connection string... I'm getting an error on myConnection.Open()

            // String conString = @"Data Source=YGUYON-PC\YGUYON28;Initial Catalog=BobTaper;Persist Security Info=True;User ID=xx;Password=xx;Pooling=false;";

           //

            myConnection.Open();