How to show "<--Select--> " in drop down box on page load?

First DropDownlist load Data from Database,Then the first text in DropDownlist is "--Select--" Text.

ListItem li = new ListItem();
li.Text = "<--Select-->";
SqlDataAdapter ada = new SqlDataAdapter("select MOVIENAME,MOVIECODE from CURMOVI", conn);
DataTable dt = new DataTable();
ada.Fill(dt);
ddlMovieName.DataSource = dt;
ddlMovieName.DataTextField = "MOVIENAME";
ddlMovieName.DataValueField = "MOVIECODE";
ddlMovieName.DataBind();
ddlMovieName.Items.Insert(0, li);


******************************** (OR) ******************************


SqlDataAdapter ada = new SqlDataAdapter("select MOVIENAME,MOVIECODE from CURMOVI", conn);
DataTable dt = new DataTable();
ada.Fill(dt);
ddlMovieName.DataSource = dt;
ddlMovieName.DataTextField = "MOVIENAME";
ddlMovieName.DataValueField = "MOVIECODE";
ddlMovieName.DataBind();
ddlMovieName.Items[0].Text = "--Select--";