private void button1_Click(object sender, EventArgs e)
{
int id = (int)dataGridView1.SelectedRows[0].Cells[0].Value;
ShowCardForm form = new ShowCardForm(id);
form.Show();
}
private void dataGridView1_MouseDoubleClick(object sender, MouseEventArgs e)
{
var collection1 = dataGridView1.SelectedRows[0];
var collection2 = collection1.Cells;
var collection3 = (int)collection2[0].Value;
ShowCardForm form = new ShowCardForm(collection3);
form.Show();
}