entity framework5 sqlserver2005 事务（TransactionScope）报未启用MSDTC错误解决办法

详情请看：http://stackoverflow.com/questions/12809958/ef-how-do-i-call-savechanges-twice-inside-a-transaction

using (var transaction = new TransactionScope())
{
    // Do something

    db.SaveChanges();

    // Do something else

    db.SaveChanges();

    tramsaction.Complete();
}

使用上面代码会报数据库没有启用MSDTC。。

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解决方法：

var objectContext = ((IObjectContextAdapter)db).ObjectContext;

try {
    objectContext.Connection.Open();
    using (var transaction = new TransactionScope()) {
        // Do something

        db.SaveChanges();

        // Do something else

        db.SaveChanges();

        tramsaction.Complete();
    }
} finally {
    objectContext.Connection.Close();
}