public static ObservableCollection <Familia> collectionFamilias()
        {
            SqlConnection cnn = new SqlConnection(ClasesBase.Properties.Settings.Default.conexion);
            SqlCommand    cmd = new SqlCommand();

            cmd.CommandText = "SELECT * FROM Familia";
            cmd.CommandType = CommandType.Text;
            cmd.Connection  = cnn;
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            ObservableCollection <Familia> obCol = new ObservableCollection <Familia>();
            DataTable dt = new DataTable();

            da.Fill(dt);

            foreach (DataRow row in dt.Rows)
            {
                Familia family = new Familia();
                family.Fam_Id      = (int)row["fam_id"];
                family.Fam_Descrip = (string)row["fam_descrip"];
                obCol.Add(family);
            }
            return(obCol);
        }