private void StudentsButton_Click(object sender, EventArgs e)
{
dataGridView.Rows.Clear();
dataGridView.ColumnCount = 3;
dataGridView.Columns[0].Name = "Id";
dataGridView.Columns[1].Name = "Name";
dataGridView.Columns[2].Name = "Email";
String[][] ds = controller.getStudents();
for (int i = 0; i < ds.Length; i++)
{
dataGridView.Rows.Add(ds[i]);
}
}