//-- function used to reset the fields background color
        public void ResetFields()
        {
            Control[] Carr = new Control[this.Controls.Count];
            this.Controls.CopyTo(Carr, 0);

            for (int i = 0; i < Carr.Length; i++)
            {
                if (Carr[i].GetType().ToString().IndexOf("TextBox") > 0)
                {
                    Carr[i].BackColor = SystemColors.Window;
                }
            }
        }