How to: Bracket Data Submissions by Using Transactions (LINQ to Entity)

Once you have created the Entity Framework then you can insert data to your database.

The code below will insert the data into 2 tables, Orders and OrderDetails. In error free condition this piece of code will run perfectly.

       protected void Button1_Click(object sender, EventArgs e)
        {
          OMSEntities context = new OMSEntities();
          //fill order form
          Order ord = new Order();
          ord.OrderID = 9999;
          ord.CustomerID = 1;
          ord.OrderDate = DateTime.Parse(“01/01/2011”);
          // fill order details
          OrderDetail ordd = new OrderDetail();
          ordd.OrderID = 9999;
          ordd.ProductID = 11;
          ordd.Quantity = 1;
          //submit order and order details to database
          context.AddToOrders(ord);
          context.SaveChanges();
          context.AddToOrderDetails(ordd);
          context.SaveChanges();
          }
        }
 
What if ProductID never existed? The code above will commit the first SaveChange and fail the second one. Imaging the sales executive is telling you “Sir, we have your sales order but you do not order anything.”

If you do not want this to happen to your company then add the TransactionScope like the modified code below.
          using (TransactionScope ts = new TransactionScope())
          {
            try
            {
              context.AddToOrders(ord);
              context.SaveChanges();

              context.AddToOrderDetails(ordd);
              context.SaveChanges();
              ts.Complete();
            }
            catch (Exception ex)
            {
              Response.Write(ex.ToString());
            }
          }
 
Download the complete code from http://skydrive.live.com. The sample file name is WebAppTransac.rar and database OMSDatabase.zip. My MSN ID is chanmmn@hotmail.com.
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About chanmingman

Since March 2011 Microsoft Live Spaces migrated to Wordpress (http://www.pcworld.com/article/206455/Microsoft_Live_Spaces_Moves_to_WordPress_An_FAQ.html) till now, I have is over 1 million viewers. This blog is about more than 50% telling you how to resolve error messages, especial for Microsoft products. The blog also has a lot of guidance teaching you how to get stated certain Microsoft technologies. The blog also uses as a help to keep my memory. The blog is never meant to give people consulting services or silver bullet solutions. It is a contribution to the community. Thanks for your support over the years. Ming Man is Microsoft MVP since year 2006. He is a software development manager for a multinational company. With 25 years of experience in the IT field, he has developed system using Clipper, COBOL, VB5, VB6, VB.NET, Java and C #. He has been using Visual Studio (.NET) since the Beta back in year 2000. He and the team have developed many projects using .NET platform such as SCM, and HR based applications. He is familiar with the N-Tier design of business application and is also an expert with database experience in MS SQL, Oracle and AS 400.
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