LINQ and handling rollbacks

I have an image upload handler (.ASHX). I am storing image meta data in the database and am naming the image from the id of that entry into the database. I am using LINQ and getting the ID back after I call SubmitChanges. Then I use that id to save the image. I obviously want to rollback the insert if the File.SaveAs fails. Is my code below correct?

using (UserDataContext userDataContext = new UserDataContext())
{
    GalleryImage galleryImage = new GalleryImage();
    galleryImage.metaName = "some meta stuff";
    userDataContext.GalleryImages.InsertOnSubmit(galleryImage);
    System.Data.Common.DbTransaction transaction = userClassContext.Transaction;
    userDataContext.SubmitChanges();
    try
    {
        string targetPath = "somepath/" + galleryImage.Id;
        file.SaveAs(target开发者_如何学JAVAFilePath);
    }
    catch
    {
        transaction.Rollback();
    }
}

Thanks

It is partially correct.

You, however, need to explicitly create a transaction before calling SubmitChanges().