Linq To Sql and identity_insert

Question

I am trying to do record inserts on a table where the Primary Key is an Identity field.

I have tried calling
mycontext.ExecuteCommand("S

Answer 1

Another option is to wrap all your Linq2Sql calls in a TransactionScope(). This should force them all to run in the same connection.

using System.Transactions; // Be sure to add a reference to System.Transactions.dll to your project.

       // ... in a method somewhere ...
       using (System.Transaction.TransactionScope trans = new TransactionScope())
       {
          using(YourDataContext context = new YourDataContext())
          {
             context.ExecuteCommand("SET IDENTITY_INSERT MyTable ON");

             context.ExecuteCommand("yourInsertCommand");

             context.ExecuteCommand("SET IDENTITY_INSERT MyTable OFF");
          }
          trans.Complete();
       }
       // ...

Although, if you are trying to do something like:

context.ExecuteCommand("SET IDENTITY_INSERT MyTable ON");
context.MyTable.InsertOnSubmit(myTableObject)
context.SubmitChanges()
context.ExecuteCommand("SET IDENTITY_INSERT MyTable OFF");

you will probably run into other issues, especially if the identity column has the IsDbGenerated attribute set to true. The SQL command generated by Linq2Sql will not know to include the identity column and value.