private void button7_Click(object sender, EventArgs e)
{
foreach (DataGridViewRow row in dataGridViewStudents.SelectedRows)
{
AddStudentform form = new AddStudentform(this, true, row.Cells[0].Value.ToString());
form.Show();
}
}
private void button3_Click(object sender, EventArgs e)
{
Form form = new AddStudentform(this);
form.Show();
}