database connection

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;

namespace DAL
{
    public class DBConn
    {
        private static SqlConnection Conn;

        private DBConn()
        {
        }

        public static SqlConnection getDbConnection()
        {
            try
            {
                if (Conn == null)
                {
                    Conn = new SqlConnection(ConfigurationManager.ConnectionStrings["watsandatabaseConnectionString"].ConnectionString);

                    Conn.Open();
                }

                else if (Conn.State == ConnectionState.Closed)
                {
                    Conn = new SqlConnection(ConfigurationManager.ConnectionStrings["watsandatabaseConnectionString"].ToString());
                    Conn.Open();
                }


                return Conn;
            }
            catch (Exception)
            {
               
                throw;
            }
           
        }
    }
}