asp.net - Update one cell after adding the new row with same values in gridview -

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i want make shopping cart datatable, wrote following code here make list of products 

public  datatable shoppingcartlist(string proname , string country,      string area ,string address,int quantity,decimal price,datetime date) {     datatable dt = new datatable();      if (httpcontext.current.session["shoppinglist"]==null)     {           dt.columns.add("proname");         dt.columns.add("odate");         dt.columns.add("ocountry");         dt.columns.add("oarea");         dt.columns.add("oaddress");         dt.columns.add("quantity");         dt.columns.add("price");         dt.columns.add("subtotal");          dt.constraints.add("proid_pk", dt.columns[0], true);     }     else     {         dt = (datatable)httpcontext.current.session["shoppinglist"];          datarow dr = dt.newrow();         dr[0] = proname;         dr[1] = date;         dr[2] = country;         dr[3] = area;         dr[4] = address;         dr[5] = quantity;         dr[6] = price;         dr[7] = quantity * price;          dt.rows.add(dr);           }     return dt; }

it binds data fine no problem, insert same row same value inserted in new record in gridview, don't want want update 1 cell (i mean when add new record same values want quantity value on increase without adding new record in gridview) mark on image

enter image description here

after long testing , googleing done , here code used 

public  datatable shoppingcartlist(string proname , string country,      string area ,string address,int quantity,decimal price,datetime date) {       datatable dt = new datatable();     if (httpcontext.current.session["shoppinglist"]==null)     {       dt.columns.add("proname");     dt.columns.add("odate");     dt.columns.add("ocountry");     dt.columns.add("oarea");     dt.columns.add("oaddress");     dt.columns.add("quantity");     dt.columns.add("price");     dt.columns.add("subtotal");     datarow dr = dt.newrow();     dr[0] = proname;     dr[1] = date;     dr[2] = country;     dr[3] = area;     dr[4] = address;     dr[5] = quantity;     dr[6] = price;     dr[7] = quantity * price;     dt.rows.add(dr);      }     else     {       dt = (datatable)httpcontext.current.session["shoppinglist"];      dataview dv = dt.defaultview;     dv.sort = "proname";     int found;     string proname;       datarow dr;         (int = 0; < dt.rows.count; i++)         {             dr = dt.rows[i];           proname = dr[0].tostring();        found = dv.find(proname);           if (found != -1)         {             foreach (datarow pro in dt.rows)             {                 (int x = 0; x < dt.rows.count; x++)             {                 if (dt.rows[x]["proname"].tostring()==proname)                 {                     dt.rows[x]["quantity"] = convert.toint16(dt.rows[x]["quantity"]) + quantity;                 }             }             }          }            }                   }    return dt; }

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