Run Customer Store Procedure within Plugin in CRM 2013

We use to run the custom store procedure on CRM 4.0 Server within plugin to do some custom coding like below ...

string orgName =CrmContext.Current.OrganizationName;

           OrganizationConfiguration config =OrganizationConfiguration.GetByOrganizationName(orgName);

           DbConnectionStringBuilder connStr =newDbConnectionStringBuilder();

            connStr.ConnectionString = config.ConnectionString;

            connStr["Provider"] = null;

           this.ConnectionString = connStr.ConnectionString;

Now, if I use try to use similar approach into CRM 2013, I get below error:-



Does any one have any example/work around or suggestion on this??