private void Bind_PI(string Interval) { ListItem liselect = new ListItem("--Select--", "0", true); ddlPIList.Items.Clear(); ddlPIList.DataSource = objBLL.Get_AllPI_List(ddlInterval.SelectedValue); ddlPIList.DataTextField = "Name"; ddlPIList.DataValueField = "ID"; ddlPIList.DataBind(); ddlPIList.Items.Insert(0, liselect); ddlPIList.SelectedValue = "0"; }