private void Form1_Activated(object sender, EventArgs e)
{
List <DTOAlumnos> alumnos = new List <DTOAlumnos>();
alumnos = new DAOAlumnos().GetAlumnos();
this.dataGridView1.DataSource = alumnos.ToArray();
}
private void borrar_button_Click(object sender, EventArgs e)
{
List <DTOAlumnos> alumnos = new List <DTOAlumnos>();
alumnos = new DAOAlumnos().GetAlumnos();
foreach (DTOAlumnos temp in alumnos)
{
new DAOAlumnos().DeleteAlumno(temp.codigo);
}
alumnos = new DAOAlumnos().GetAlumnos();
this.dataGridView1.DataSource = alumnos.ToArray();
}