private void BindTruck()
{
BindDropdownDAL obj = new BindDropdownDAL();
var TruckNolst = obj.BindTruckNoPurchase();
ddlLorry.DataSource = TruckNolst;
ddlLorry.DataTextField = "Lorry_No";
ddlLorry.DataValueField = "lorry_idno";
ddlLorry.DataBind();
ddlLorry.Items.Insert(0, new System.Web.UI.WebControls.ListItem("--Select--", "0"));
}