//You can change the background color of a form or change the window size dyanmically 


  private void optBlue_CheckedChanged(object sender, EventArgs e)
        {
            //---to use color, you have two options:

        //---1. If the using system.Drawing is included in your form, use this:

        this.BackColor = Color.Blue;

        //---2. Or, type in the entire reference here:
        this.BackColor = System.Drawing.Color.Blue;

        }
        //________________________________________________________________________________________________

        private void optRed_CheckedChanged(object sender, EventArgs e)
        {
            this.BackColor =Color.Red;
        }
        //________________________________________________________________________________________________

        private void optGreen_CheckedChanged(object sender, EventArgs e)
        {
            this.BackColor = Color.Green;
        }
        //________________________________________________________________________________________________

        private void optGray_CheckedChanged(object sender, EventArgs e)
        {
            this.BackColor = Color.LightGray;
        }
        //________________________________________________________________________________________________

        private void optMin_CheckedChanged(object sender, EventArgs e)
        {
            this.WindowState = FormWindowState.Minimized;
        }
        //________________________________________________________________________________________________

        private void optMax_CheckedChanged(object sender, EventArgs e)
        {
            this.WindowState = FormWindowState.Maximized;
        }
        //________________________________________________________________________________________________

        private void optNormal_CheckedChanged(object sender, EventArgs e)
        {
            this.WindowState = FormWindowState.Normal;
        }
        //________________________________________________________________________________________________