Difference between DropDownList.Items.Add and DropDownList.Items.Insert method

Answer:

DropDownList.Items.Add method allows you to add new ListItem into the DropDownList. This item will be added as the last item of the DropDownList.

dropDownList.Items.Add(new ListItem("Default Panel", "0"));

DropDownList.Items.Insert method allows you to specify the index of the item within the DropDownList where you want to insert the ListItem.

dropDownList.Items.Insert(0, new ListItem("Default Panel", "0"));

Here Default Value will be added as the first item in the DropDown.