web.confif connection string

 <connectionStrings>
    <add name="conStr" connectionString="Data source=<sqlserver name>; initial catalog= <DBName>;Integrated Security=True" />
    <!--<add name="conStr" connectionString="Data source=<sqlserver>; user id=sa;password=<password>;initial catalog=<DBName>;Integrated Security=SSPI;" />-->
  </connectionStrings>
string constr =  System.Configuration.ConfigurationManager.ConnectionStrings["conStr"].ConnectionString;