Forms Data Controls :: FormView ItemUpdating / Custom Update For A Form View?

I need to do a custom update for a form view (I think/know), as some of the parameters that are required for updating values should not be updated by the users, such as userid of the person performing the action which is passed back to the database for auditing purposes.

Additionally, there are some fields, such as LastUpdatedBy, LastUpdatedDate that need to be seen, but not edited. The stored procedure on the backend takes care of this, and these are not parameters for the Update method. The FormView by default is trying to pass all these values back to the database.

Lasty, the select query of the object datasource is a stored procedure that performs several joins based on PF/FK relationships to bring back more meaningful information than just a FK, so some columns are just the joined value, and can not be updated directly. Again, formview is trying to pass these parameters

So given that, I have defined the following even handler for a simple form view:

(not sure if this is the way to proceed given the above, but...)

protected void FormView1_ItemUpdating(object sender, FormViewUpdateEventArgs e)
{
ProjectDetailsDataSource.UpdateParameters.Clear();
ProjectDetailsDataSource.UpdateParameters.Add("projectID", ((Guid)e.Keys["ProjectID"]).ToString());
ProjectDetailsDataSource.UpdateParameters.Add("projectName", (string)e.NewValues["ProjectName"]);
ProjectDetailsDataSource.UpdateParameters.Add("description", (string)e.NewValues["Description"]);
ProjectDetailsDataSource.UpdateParameters.Add("projectTypeID", "1");
ProjectDetailsDataSource.UpdateParameters.Add("statusID", "1");
ProjectDetailsDataSource.UpdateParameters.Add("productID", null);
ProjectDetailsDataSource.UpdateParameters.Add("isComplete", ((bool)e.NewValues["IsComplete"]).ToString());
ProjectDetailsDataSource.UpdateParameters.Add("isActive", ((bool)e.NewValues["IsActive"]).ToString());
ProjectDetailsDataSource.UpdateParameters.Add("userid", Membership.GetUser().ProviderUserKey.ToString());
ProjectDetailsDataSource.Update();
FormView1.ChangeMode(FormViewMode.ReadOnly);
e.Cancel = true;
}

My questions are as follows:

1) Is this the right approach?

2) Is so, when I cancel the edit (because I did the update myself), and change mode, the FormView returns to read only mode as inteneded (good so far). However, when I hit F5 (refresh), the ItemUpdating method is called again, and updates the database.