How to change the background color in Mdi parent form in c#

try this :

 private void setBackGround()
        {
            foreach (Control ctl in this.Controls)
            {
                try
                {
                    System.Windows.Forms.Control Mdi = (MdiClient)ctl;
                    Mdi.BackColor = Color.FromA#0096ff;
                }
                catch (Exception a)
                {
                }
            }
        }