Remove duplicate values from dropdownlist

I don't see any problem here. Remove the ListItems from dropdowns in ASPX

Sir,

I dont understand where the mistake is ?

In the ASPX you will have default Items. Since you are binding from database. Remove it

Sir,

After binding the dropdownlist i also need the default value at 0th index i have -Select- according to requirement.. You mean i must remove the item at 0th index?

No. Not that. Other than that if any. Since your code is fine and I see no reason for duplicates. Can you paste one dropdown HTML so that I can see it