switch(month)
{
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
for(i=1;i<=31;i++)
AlDay.Add(i);
break;
case 2:
if (CheckLeap(year))
{for(i=1;i<=29;i++)
AlDay.Add(i);}
else
{for(i=1;i<=28;i++)
AlDay.Add(i);}
break;
case 4:
case 6:
case 9:
case 11:
for(i=1;i<=30;i++)
AlDay.Add(i);
break;
}
DropDownList3.DataSource=AlDay;
DropDownList3.DataBind();
}