Principa.cs

using System;
using System.ComponentModel;
using System.Windows.Forms;
using R706GuardarConfiguracion.Properties;

namespace R706GuardarConfiguracion
{
    public partial class Principal : Form
    {
        public Principal()
        {
            InitializeComponent();
        }

        private void btnCambiarConfiguracion_Click(object sender, EventArgs e)
        {
            Button btnPresionado = sender as Button;

            if (btnPresionado != null)
            {
                txtCampoTexto.BackColor = btnPresionado.BackColor;

                Settings.Default.ColorTexto = txtCampoTexto.BackColor;
            }
        }

        protected override void OnClosing(CancelEventArgs evt)
        {
            base.OnClosing(evt);

            Settings.Default.UbicacionVentana = this.Location;

            Settings.Default.Save();
        }
    }
}