How to add an extra item to the DropDownList filled with data from a database?

VB.NET

’DropDownList1.Items.Insert(0, 'Please Select')
DropDownList1.Items.Insert(0, new ListItem('<text>', '<value>'))

C#

//DropDownList1.Items.Insert(0, 'Please Select');
DropDownList1.Items.Insert(0, new ListItem('<text>', '<value>'));

This should be done after .DataBind of dropdownlist