private void LoadMaxDay()
{
this.cboDay.Items.Clear();
int year = int.Parse(this.cboYear.Text);
int month = int.Parse(this.cboMonth.Text);
int max = DateTimeClass.GetMonthMaxDay(year, month);
this.cboDay.Items.Add("全部");
for (int d = 1; d <= max; d++)
{
this.cboDay.Items.Add(d.ToString());
}
this.cboDay.SelectedIndex = 0;
}