protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { dal obj = new dal(); DataSet ds = obj.GetCityList(); if (ds.Tables.Count > 0) { SourceCity.DataSource = ds.Tables[0]; SourceCity.DataTextField = "cityname"; SourceCity.DataValueField = "CityID"; DestCity.DataSource = ds.Tables[0]; DestCity.DataTextField = "cityname"; DestCity.DataValueField = "cityid"; DataBind(); } } }