c# - Linq to sql update does now work -


i'm trying update data database using linq. of other codes write in following method work expected update code @ marked line not work. no changes in database. have debugged , i'am getting values expected user. problem change expect in database. can problem ?

    private void addtocart()     {         fixbaydbdatacontext db = new fixbaydbdatacontext();          if (session["customerauthentication"] != null)         {             carttbl carttbl = new carttbl();             cartshoetbl cstbl = new cartshoetbl();              int cusid = convert.toint32(session["customerauthentication"]);             int shoeid = convert.toint32(sizeddl.text);               var idquery = c in db.carttbls.asqueryable()                           c.customerid == cusid                           select new{c.cartid,c.customerid};               var shoequery = s in db.shoetbls.asqueryable()                             join m in db.shoemodeltbls on s.modelid equals m.modelid                             s.shoeid == shoeid                             select new { s.shoeid, m.price };              int quantity = convert.toint32(quantityddl.text);             double shoeprice = (double)shoequery.first().price;             double totalprice = quantity * shoeprice;             //int shoeid = (int)shoequery.first().shoeid;             //int lastshoeid = 0;              if (idquery.any())             {                 int cartid = (int)idquery.firstordefault().cartid;                 var cartshoequery = ca in db.cartshoetbls.asqueryable()                                     ca.cartid == cartid && ca.shoeid == shoeid                                     select ca;                  if (cartshoequery.any())                 {                     cstbl.quantity += convert.toint32(quantityddl.text);                     db.submitchanges();                 }                 else                 {                     var cartquery = ca in db.carttbls.asqueryable()                                     ca.customerid == cusid                                     select new { ca.cartid, ca.totalprice };                      double currenttotal = (double)cartquery.firstordefault().totalprice;                     currenttotal = currenttotal + totalprice;                      carttbl.totalprice = currenttotal;  //update line                 db.submitchanges();                      cstbl.cartid = cartquery.first().cartid;                     cstbl.shoeid = shoeid;                     cstbl.quantity = convert.toint32(quantityddl.text);                      db.cartshoetbls.insertonsubmit(cstbl);                     db.submitchanges();                 }             }             else             {                 carttbl.customerid = cusid;                 carttbl.totalprice = totalprice;                  db.carttbls.insertonsubmit(carttbl);                  cstbl.cartid = carttbl.cartid;                 cstbl.shoeid = shoeid;                 cstbl.quantity = quantity;                  db.cartshoetbls.insertonsubmit(cstbl);                  db.submitchanges();             }         }         else          {             response.write("<script>alert('please login before start shopping !');</script>");         }     }

carttbl never set value belongs database. it's new carttbl created , it's not in database. need change that's in database update database.


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