private void comboBoxMainProbaNrPart_SelectedIndexChanged(object sender, EventArgs e)
{
String proba = comboBoxMainProbaNrPart.GetItemText(comboBoxMainProbaNrPart.SelectedItem);
if (proba != "")
{
int numar = controller.NumarParticipariProba(proba);
textBoxMainNrPartic.Text = numar.ToString();
}
else
{
textBoxMainNrPartic.Text = "";
}
}