Question : How to close linq to sql connection in database access layer

I using linq to sql where I have two enties in datacontext file epar and shoppingcart

I had implemented linq to sql in my database access layer I am closing the database connection with using(..) statement

I am returning the shoppingcart as a return object to the UI but getting error.

my code where I am reading values:

Line 1: shoppingcart cart = cartFuunctions.GetBasketItemdetails(Request.QueryString["SessionID"], Request.QueryString["ProductID"]);
Line 2: lblpartno.Text = cart.ProductCode;
Line 3: lblProductName.Text = cart.epar.descr;

On Line 2 I am able to read the data successfully but on Line 3 I am getting error message that connection is closed

Please see the code attached for the database access layer file

Thanks

1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:
15:
16:
17:
18:
19:
20:
21:
22:
23:
24:
25:
26:
27:
28:
29:
30:
31:
32:
33:
34:
35:
36:
37:
38:
39:
40:
41:
42:
43:
44:
45:
46:
47:
48:
49:
50:
51:
52:
53:
54:
55:
56:
57:
58:
59:
60:



//Database Access Layer Class
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Configuration;

namespace DAL.LinqToSql
{
    public static class CartLinqDB
    {
        private static string _connectionString;

        private static string ConnectionString
        {
            get
            {
                return _connectionString;
            }
            set
            {
                if (string.IsNullOrEmpty(_connectionString) == false)
                {
                    BindConnection();
                }
                    _connectionString = value;
                
            }
        }

        static CartLinqDB()
        {
            //Initializing connection string
            BindConnection();
        }

        /// <summary>
        /// Initializing connection string
        /// </summary>
        private static void BindConnection()
        {
            ConnectionString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
        }

        /// <summary>
        /// return the basketItem details
        /// </summary>
        /// <param name="BasketItemId"></param>
        /// <returns></returns>
        public static shoppingcart GetBasketItemdetails(string SessionID, string ProductID)
        {
            shoppingcart cart;
            using (LinqToSqlDbDataContext db = new LinqToSqlDbDataContext(ConnectionString))
            {
                cart = db.shoppingcarts.Single(p => p.SessionID == SessionID && p.ProductCode==ProductID);
            }
            return cart;
        }
    }
}

Answer : How to close linq to sql connection in database access layer

Hi shieldguy;

Try making this change in your code.

Fernando

1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:



public static shoppingcart GetBasketItemdetails(string SessionID, string ProductID)
{
    shoppingcart cart;
    using (LinqToSqlDbDataContext db = new LinqToSqlDbDataContext(ConnectionString))
    {
        DataLoadOptions dlo = new DataLoadOptions();
        dlo.LoadWith<shoppingcarts>(s => s.epar);
        db.LoadOptions = dlo;
        cart = db.shoppingcarts.Single(p => p.SessionID == SessionID && p.ProductCode==ProductID);
    }
    return cart;
}