SELECT DISTINCT [field1], [field2],field3] FROM [table]
SELECT DISTINCT [field1], [field2],field3] FROM [table] ORDER BY [field2] ASC
SELECT DISTINCT [field1], [field2],field3] FROM [table] UNION SELECT DISTINCT "","","" FROM [table] ORDER BY ORDER BY [field2] ASC
DropDownList ddl = new DropDownList(); DataView dv = GetSomeData(); ddl.DataSource = dv; ddl.DataTextField = "field1"; ddl.DataValueField = "field2"; ddl.DataBind(); ddl.Items.Insert(0, new ListItem("Please select an option", "0"));