Epicor_Integration.Item_Master.Partnumber_txt_Leave C# (CSharp) Method

        void Partnumber_txt_Leave(object sender, EventArgs e)
        {
            AllToUpper();

            //201XXXXX is a frame, 404XXXXX is a Flo-machine - both need to be serialized
            if (Partnumber_txt.Text.Substring(0, 3) == "201" || Partnumber_txt.Text.Substring(0, 3) == "404")
            {
                trackserial.Checked = true;

                bflush_chk.Checked = false;
            }
        }