['//Reference the DropDownList.', 'DropDownList dropDownList = sender as DropDownList;', '//Get the ID of the DropDownList.', 'string id = dropDownList.ID;', '//Display the Selected Text of DropDownList.', 'ClientScript.RegisterClientScriptBlock(this.GetType(), "alert", "alert(\'" + dropDownList.SelectedItem.Text + "\');", true);', '}']