找不到Connection.CreateConnectionScope(),命名空间是什么?解决思路

找不到Connection.CreateConnectionScope(),命名空间是什么?
提示:System.Data.Common.DbConnection 不包含 CreateConnectionScope

C# code

using (var dbtran = new TransactionScope(TransactionScopeOption.Required))            {                using (var t= new TestEntities())                {                     using (t.Connection.CreateConnectionScope())// EF Extension中的扩展方法，作用是open connection并在dispose里释放它                    {                                                 t.AddToTableA(t1);                            t.SaveChanges();                            var cmd = t.CreateStoreCommand("update form set xxx=xxx where formid=2", CommandType.Text);　　　　　　　　　　cmd.ExcuteNonQuery();                            dbtran.Complete();                      }　　　　　　}　　　　}

[解决办法]
using Microsoft.Data.Extensions;

http://archive.msdn.microsoft.com/EFExtensions/Release/ProjectReleases.aspx?ReleaseId=3624

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