Automatic Binding of Days, Months, Years to a DropDownList Control

write code in page load()
{
//For binding Year

for(int intyear=1900;intyear{
  drpYear.add(intyear);
}
//For binding month

for(int intmonth=1;intmonth<13 ;intmonth++)
{
  drpMonth.add(intmonth);
}
}

//selected months event

selectedIndex_drpMonth()
{
  int intyr=convert.toInt16( drpYear.selectedItem.value);
int days=28;
if(intyr%4==0)
{
 days=29;
}
swich(drpYear.selectedItem.value)
{
// write all codition for every month.
}
}

here i dont hav DB table for this format ...it is signin form user details ..in that they need to select date month year..for dat i have created 3 drop down list controls in ASP date month year...i have to bind dates month names and year...the user selected items will be save in data base...plz reply with clear format c# code

Hi, 
Question is not clear.

Please explain your scenario where & when you want to automatically bind ? whether the values are from DB or XML or hard-coded ?