Using GetEnumerable

private void cmdApplyAll_Click(object sender, EventArgs e)
{
    MessageFunctionType mMft = MessageForm.ShowMessage("Aspire Confirmation", "Are you sure that you want to apply the change to all selected parts?", 1001", MessageFunction.YesNo, MessagingIcon.Question, MessagingSounds.Question);
    if (mMft == MessageFunctionType.Yes)
    {
        waitWindow1.DisplayTitle = true;
        waitWindow1.Title = "Updating Parts";
        waitWindow1.Message = "Updating the following parts . . . \r";
        waitWindow1.ShowWaitWindow();
        foreach (PartsBO mBO in partsBO1.GetEnumerable())
        {
            waitWindow1.Message += mBO.partnum + "\r";
            mBO.Edit();
            if (chkProdAppend.Checked) { mBO.prodnotes += txtNewNote.Text; }
            if (chkProdReplace.Checked) { mBO.prodnotes = txtNewNote.Text; }
            if (chkShipAppend.Checked) { mBO.shipnotes += txtNewNote.Text; }
            if (chkShipReplace.Checked) { mBO.shipnotes = txtNewNote.Text; }
            mBO.Save();
        }
        waitWindow1.HideWaitWindow();
    }
}

The code ends up in an infinite loop after the second trip through the partsBO1 BOs. It keeps repeating the second record. What am I doing wrong?