private void User_MainInterface_Load(object sender, EventArgs e)
        {
            User_Dashboard UD = new User_Dashboard();

            UD.MdiParent = this;
            UD.Show();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            ActiveMdiChild.Close();
            User_Dashboard UD = new User_Dashboard();

            UD.MdiParent = this;
            UD.Show();
        }