SQL Server连接字符串

//windows身份验证1
            //string strCon = @"Data Source=.\sqlexpress;Initial Catalog=db1;Integrated Security=True;Pooling=False";
            
            //windows身份验证2
            //string strCon = @"server=.\sqlexpress;database=db1;Integrated Security=True;";

            //Sql Server身份验证1
            //string strCon = @"server=.\sqlexpress;database=db1;uid=sa;pwd=123456";

            //Sql Server身份验证2
            //string strCon = @"Data Source=.\sqlexpress;Initial Catalog=db1;User ID=sa;Password=123456;Pooling=False";

            /*
             从配置文件中读连接字符串
             在<configuration>标记中加上
             <connectionStrings>
                <add name="strCon" connectionString="server=.\sqlexpress;database=db1;uid=sa;pwd=123456"/> 
             </connectionStrings>
            */
            string strCon = ConfigurationManager.ConnectionStrings["strCon"].ConnectionString;